工学士, 東京大学

工学修士, 東京大学

博士(工学), 東京大学

Psychology in general

Man-machine system

Neuro Science in General

Intelligent Informatic

心理学一般

人間機械系

神経科学一般

認知科学

人間情報学

Informatics, Intelligent informatics

Informatics, Biological, health, and medical informatics

Informatics, Perceptual information processing

Humanities & social sciences, Cognitive sciences

Informatics, Sensitivity (kansei) informatics

01 Apr. 2016
電気通信大学大学院情報理工学研究科, 教授

01 Apr. 2009
電気通信大学大学院情報システム学研究科, 教授

01 Apr. 2007 - 31 Mar. 2009
電気通信大学大学院情報システム学研究科, 准教授

01 Oct. 1994 - 31 Mar. 2007
University of Electro-Communications, Associate Professor

Sep. 1994 - Sep. 1994
University of Tokyo, Assistant Professor

Apr. 1988 - Aug. 1994
University of Tokyo, Research Associate

Mar. 1988
The University of Tokyo, Graduate School, Division of Engineering, 計数工学専攻

Mar. 1986
The University of Tokyo, Faculty of Engineering, 計数工学科

Jan. 2021 - Dec. 2022
理事, 日本神経回路学会, Society

Jan. 2019 - Dec. 2020
会長, 日本神経回路学会, Society

Jan. 2018 - Dec. 2019
特任理事, 日本神経回路学会, Society

Jan. 2015 - Dec. 2017
選奨委員, 日本神経回路学会, Society

Jan. 2014 - Dec. 2017
理事, 日本神経回路学会, Society

May 2009 - May 2016
ニューロコンピューティング研究専門委員会委員, 電子情報通信学会, Society

Jul. 2012 - Jun. 2014
専門委員, 科学研究費委員会

Nov. 2007 - Dec. 2011
身体性情報学研究会副委員長, 電子情報通信学会, Society

Dec. 2009 - Nov. 2010
専門委員, 科学研究費委員会

Jun. 2008 - May 2009
ニューロコンピューティング研究専門委員会委員長, 電子情報通信学会, Society

Jan. 2005 - Mar. 2009
理事, 日本神経回路学会, Society

Jun. 2007 - May 2008
ニューロコンピューティング研究会副委員長, 電子情報通信学会, Society

Jan. 2000 - Dec. 2007
選奨委員, 日本神経回路学会, Society

Jan. 1999 - Dec. 2000
理事，会誌副編集長, 日本神経回路学会, Society

Mar. 2023
映像情報メディア学会
構成音の立ち上がりのずれが和音の音色に与える影響
ベストプレゼンテーション賞, 高山 稜平;阪口 豊
Japan society

Mar. 2019
IEEE Computational Intelligence Society Japan Chapter, 教員本人に対してではなく指導していた修士課程学生の発表に対する賞である．
Young Researcher Award
Japan society

Mar. 2018
電子情報通信学会
ヒト感覚運動メカニズムの計算論的研究
電子情報通信学会フェロー
Others

2017
Faculty1000
Faculty1000 Prime
Others

Oct. 2016
日本神経回路学会
日本神経回路学会論文賞
Japan society

Jul. 2014
日本学術振興会
日本学術振興会特別研究員等審査会専門委員（書面担当）の表彰
Others

May 2009
電子情報通信学会
低い時間解像度の運動指令がもたらす手先軌道の性質：運動指令表現の単純化仮説
電子情報通信学会論文賞
Japan society

Nov. 2007
日本神経回路学会
運動指令の最適性に関する一考察：タスク最適化とスパース表現
日本神経回路学会研究賞
Japan society

Effects of a body manipulation of Japanese martial arts on interpersonal correlation of postural sway
Watanabe, Y; Sakaguchi, Y
Last, PLoS ONE, 17, 9, e0274294, 12 Sep. 2022, Peer-reviwed
Scientific journal, English

Audiovisual synchrony perception in observing human motion to music
Takehana, A; Uehara, T; Sakaguchi, Y
PLoS ONE, 14, 8, e0221584, 2019, Peer-reviwed
Scientific journal, English

Visual Information Pianists Use for Efficient Score Reading
Aiba, E; Sakaguchi, Y
Frontiers in Psychology, 9, 2192, 2018, Peer-reviwed
Scientific journal, English

Visual Information for Efficient Score Reading by Pianists
Aiba, E; Sakaguchi Y
Proceedings of International Symposium on Performance Science 2017 (ISPS2017), 46-46, Aug. 2017, Peer-reviwed
International conference proceedings, English

Characteristics of simultaneous tapping by different hands/feet
Sato, Y; Sakai, K; Aiba, E; Sakaguchi, Y
1-4, 2017, Peer-reviwed
International conference proceedings, English

Perceptual shrinkage of a one-way motion path with high-speed motion
Yutaka Nakajima; Yutaka Sakaguchi
SCIENTIFIC REPORTS, NATURE PUBLISHING GROUP, 6, 30592, Jul. 2016, Peer-reviwed, Back-and-forth motion induces perceptual shrinkage of the motion path, but such shrinkage is hardly perceived for one-way motion. If the shrinkage is caused by temporal averaging of stimulus position around the endpoints, it should also be induced for one-way motion at higher motion speeds. In psychophysical experiments with a high-speed projector, we tested this conjecture for a one-way motion stimulus at various speeds (4-100 deg/s) along a straight path. Results showed that perceptual shrinkage of the motion path was robustly observed in higher-speed motion (faster than 66.7 deg/s). In addition, the amount of the forwards shift at the onset position was larger than that of the backwards shift at the offset position. These results demonstrate that high-speed motion can induce shrinkage, even for a one-way motion path. This can be explained by the view that perceptual position is represented by the integration of the temporal average of instantaneous position and the motion representation.
Scientific journal, English

Relationship between Musical Characteristics and Temporal Breathing Pattern in Piano Performance
Yutaka Sakaguchi; Eriko Aiba
FRONTIERS IN HUMAN NEUROSCIENCE, FRONTIERS MEDIA SA, 10, 00381, Jul. 2016, Peer-reviwed, Although there is growing evidence that breathing is modulated by various motor and cognitive activities, the nature of breathing in musical performance has been little explored. The present study examined the temporal breath pattern in piano performance, aiming to elucidate how breath timing is related to musical organization/events and performance. In the experiments, the respiration of 15 professional and amateur pianists, playing 10 music excerpts in total (from four-octave C major scale, Hanon's exercise, J. S. Bach's Invention, Mozart's Sonatas, and Debussy's Clair de lune), was monitored by capnography. The relationship between breathing and musical characteristics was analyzed. Five major results were obtained. (1) Mean breath interval was shortened for excerpts in faster tempi. (2) Fluctuation of breath intervals was reduced for the pieces for finger exercise and those in faster tempi. Pianists showing large within-trial fluctuation also exhibited large inter-excerpt difference. (3) Inter-trial consistency of the breath patterns depended on the excerpts. Consistency was generally reduced for the excerpts that could be performed mechanically (i.e., pieces for finger exercise), but interestingly, one third of the participant showed consistent patterns for the simple scale, correlated with the ascending/descending sequences. (4) Pianists tended to exhale just after the music onsets, inhale at the rests, and inhibit inhale during the slur parts. There was correlation between breathing pattern and two-voice polyphonic structure for several participants. (5) Respiratory patterns were notably different among the pianists. Every pianist showed his or her own characteristic features commonly for various musical works. These findings suggest that breathing in piano performance depends not only on musical parameters and organization written in the score but also some pianist-dependent factors which might be ingrained to individual pianists.
Scientific journal, English

State Variables of the Arm May Be Encoded by Single Neuron Activity in the Monkey Motor Cortex
Eizo Miyashita; Yutaka Sakaguchi
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 63, 3, 1943-1952, Mar. 2016, Peer-reviwed, Revealing the type of information encoded by neurons activity in the motor cortex is essential not only for understanding the mechanism of motion control but also for developing a brain-machine interface. Thus far, the concept of preferred direction (PD) vector has dominated the discussion regarding how neural activity encodes information; however, a unified view of exactly what information is encoded has not yet been established. In this study, a model was constructed to describe temporal neuron activity by a dot product of the PD and the movement variables vector consisting of joint torque and angular velocity. The plausibility of this model was tested by comparing estimated neural activity with that recorded from the monkey motor cortex, and it was found that this model was able to explain the temporal pattern of neuron activity irrespective of its passive responsiveness. The mean determination coefficients of neurons that responded to proprioceptive stimuli and that responded to visual stimuli were relatively high values of 0.57 and 0.58, respectively. These results suggest that neurons in the monkey motor cortex encode state variables of the arm in a framework of modern control theory and that this information could be decoded for controlling a brain-machine interface.
Scientific journal, English

Dynamic information space based on high-speed sensor technology
Masatoshi Ishikawa; Hiroyuki Shinoda; Yoshihiro Watanabe; Idaku Ishii; Yutaka Sakaguchi; Makoto Shimojo; Yutaka Nakajima; Hirotsugu Yamamoto; Takashi Komuro; Hiromasa Oku
Human-Harmonized Information Technology, Volume 1: Vertical Impact, Springer Japan, 97-136, 01 Jan. 2016, Peer-reviwed, The purpose of this research is to realize a dynamic information space harmonizing human perception system, recognition system, and motor system. Toward this purpose, our key technology is high-speed sensor technology and display technology focusing on vision and haptic sense which performs at the order of kHz. Based on these technologies, our information space can obtain the dynamics of humans and objects in perfect condition and displays information at high speed. As subsystems for our goal, we have newly developed four important elemental technologies including high-speed 3D vision toward insensible dynamics sensing, high-speed resistor network proximity sensor array for detecting nearby object, noncontact low-latency haptic feedback, and high-speed display of visual information for information sharing and operation in real space. Also, in order to achieve the coordinated interaction between individual humans and this information space, we have conducted the research about the human perceptual and motor functions for coordinated interaction with high-speed information environment. In addition, we have developed various application systems based on the concept of dynamic information space by integrating the subsystems.
In book, English

視覚心理実験に対する高速プロジェクタの適用
中嶋 豊; 阪口 豊
日本バーチャルリアリティ学会論文誌, 日本バーチャルリアリティ学会, 21, 1, 7-14, Jan. 2016, Peer-reviwed, In visual psychophysics, a CRT monitor has been widely used to present visual stimuli, while its temporal resolution was limited by its frame length of about 5 ms (i.e., refresh rate of 200 Hz). Recently, however, a high speed DLP projector was introduced to the market, which realizes much shorter frame length (〜 0.2 ms) for binary images. For such projectors, moreover, the duty ratio of the optical images can be manipulated, which makes it possible to investigate the mechanism of human temporal visual processing which cannot be accessed with the conventional visual devices. In this paper, we explain some temporal properties of the projector essential to the psychophysical experiments and show an example of experimental setup made in combination of the projector with a programming library for psychophysical experiments.
Scientific journal, Japanese

Transient twinkle perception is induced by sequential presentation of stimuli that flicker at frequencies above the critical fusion frequency
Yutaka Nakajima; Yutaka Sakaguchi
ATTENTION PERCEPTION & PSYCHOPHYSICS, SPRINGER, 77, 8, 2711-2727, Nov. 2015, Peer-reviwed, The critical fusion frequency (CFF) is a threshold that represents the temporal limits of the human visual system. If two flickering stimuli with equal subjective luminances are presented simultaneously at different locations, the CFF is the temporal frequency above which they cannot be distinguished. However, when the stimuli are presented sequentially at the same position, a transient twinkle can be perceived around the moment of the changeover. To investigate the mechanism underlying this transient twinkle perception (TTP), we independently manipulated the luminance contrast and temporal frequency of the flicker, as well as the interstimulus interval (ISI). We found that TTP was greater as the luminance step was larger, was stably perceived for flicker frequencies up to 200 Hz, and was robust for all ISIs if flicker frequencies were below 250 Hz. For 250- and 300-Hz flickers, TTP was attenuated in conditions in which one-frame and two-frame ISIs were inserted. These results can be explained by a simple filtering model: TTP occurs if the temporal change in the weighted moving average of stimulus luminance exceeds a certain threshold. TTP gives additional evidence that the human visual system can detect the transient change of flicker stimuli at much higher temporal frequencies than the CFF, by an averaging mechanism of luminance.
Scientific journal, English

Adaptive intermittent control: A computational model explaining motor intermittency observed in human behavior
Yutaka Sakaguchi; Masato Tanaka; Yasuyuki Inoue
NEURAL NETWORKS, PERGAMON-ELSEVIER SCIENCE LTD, 67, 92-109, Jul. 2015, Peer-reviwed, It is a fundamental question how our brain performs a given motor task in a real-time fashion with the slow sensorimotor system. Computational theory proposed an influential idea of feed-forward control, but it has mainly treated the case that the movement is ballistic (such as reaching) because the motor commands should be calculated in advance of movement execution. As a possible mechanism for operating feed-forward control in continuous motor tasks (such as target tracking), we propose a control model called "adaptive intermittent control" or "segmented control," that brain adaptively divides the continuous time axis into discrete segments and executes feed-forward control in each segment. The idea of intermittent control has been proposed in the fields of control theory, biological modeling and nonlinear dynamical system. Compared with these previous models, the key of the proposed model is that the system speculatively determines the segmentation based on the future prediction and its uncertainty. The result of computer simulation showed that the proposed model realized faithful visuo-manual tracking with realistic sensorimotor delays and with less computational costs (i.e., with fewer number of segments). Furthermore, it replicated "motor intermittency", that is, intermittent discontinuities commonly observed in human movement trajectories. We discuss that the temporally segmented control is an inevitable strategy for brain which has to achieve a given task with small computational (or cognitive) cost, using a slow control system in an uncertain variable environment, and the motor intermittency is the side-effect of this strategy. (C) 2015 Elsevier Ltd. All rights reserved.
Scientific journal, English

A wavelet-based method for extracting intermittent discontinuities observed in human motor behavior
Yasuyuki Inoue; Yutaka Sakaguchi
NEURAL NETWORKS, PERGAMON-ELSEVIER SCIENCE LTD, 62, 91-101, Feb. 2015, Peer-reviwed, Human motor behavior often shows intermittent discontinuities even when people try to follow a continuously moving target. Although most previous studies revealed common characteristics of this "motor intermittency" using frequency analysis, this technique is not always appropriate because the nature of the intermittency is not stationary, i.e., the temporal intervals between the discontinuities may vary irregularly. In the present paper, we propose a novel method for extracting intermittent discontinuities using a continuous wavelet transform (CWT). This method is equivalent to the detection of peak of the jerk profile in principle, but it successfully and stably detects discontinuities using the amplitude and phase information of the complex wavelet transform. More specifically, the singularity point on the time-scale plane plays a key role in detecting the discontinuities. Another important feature is that the proposed method does not require parameter tuning because it is based on the nature of hand movement. In addition, this method does not contain any optimization process, which avoids explosive increase in computational cost for long time-series data. The performance of the proposed method was examined using an artificial trajectory composed of several primitive movements, and an actual hand trajectory in a continuous target-tracking task. The functional rationale of the proposed method is discussed. (C) 2014 Elsevier Ltd. All rights reserved.
Scientific journal, English

Phase shifts in alpha-frequency rhythm detected in electroencephalograms influence reaction time
Yasushi Naruse; Ken Takiyama; Masato Okada; Hiroaki Umehara; Yutaka Sakaguchi
NEURAL NETWORKS, PERGAMON-ELSEVIER SCIENCE LTD, 62, 47-51, Feb. 2015, Peer-reviwed, Although the phase shifts in ongoing oscillations seen in electroencephalograms (EEGs) and magnetoencephalograms are an important factor in discussions of phase dynamics, such as synchrony and reset, few studies have focused specifically on the phase shift. Here we investigate the relationship between phase shifts in alpha-frequency rhythms and reaction times during a visual simple reaction task by applying our previously described method (Naruse et al., 2013), which enables detection of phase shifts from a single EEG trial. In the left, parietal, and occipital areas, the reaction times in the trials in which phase shifts were detected before the button press were significantly longer than in those in which phase shifts were not so detected. These results indicate that phase shifts in the alpha and mu rhythms relate to variability in reaction times. (C) 2014 Elsevier Ltd. All rights reserved.
Scientific journal, English

Periodic change in phase relationship between target and hand motion during visuo-manual tracking task: Behavioral evidence for intermittent control
Yasuyuki Inoue; Yutaka Sakaguchi
HUMAN MOVEMENT SCIENCE, ELSEVIER SCIENCE BV, 33, 211-226, Feb. 2014, Peer-reviwed, When one performs visuo-manual tracking tasks, velocity profile of hand movements shows discontinuous patterns even if the target moves smoothly. A crucial factor of this "intermittency" is considerable delay in the sensorimotor feedback loop, and several researchers have suggested that the cause is intermittent correction of motor commands. However, when and how the brain monitors task performance and updates motor commands in a continuous motor task is uncertain. We examined how tracking error was affected by the timing of target disappearance during a tracking task. Results showed that tracking error, defined as the average phase difference between target and hand, varied periodically in all conditions. Hand preceded target at one specific phase but followed it at another, implying that motor control was not performed in a temporally uniform manner. Tracking stability was evaluated by the variance in phase difference, and changed depending on the timing of target-removal. The variability was larger when target disappeared around turning points than that when it disappeared around the center of motion. This shows that visual information at turning points is more effectively exploited for motor control of sinusoidal target tracking, suggesting that our brain controls hand movements with intermittent reference to visual information. (C) 2013 Elsevier B.V. All rights reserved.
Scientific journal, English

Intermittent brain motor control observed in continuous tracking task
Sakaguchi, Y
Advances in Cognitive Neurodynamics (III), 461-468, Mar. 2013, Peer-reviwed
International conference proceedings, English

Intermittent brain motor control observed in continuous tracking task
Sakaguchi, Y
Advances in Cognitive Neurodynamics (III), 461-468, Mar. 2013, Peer-reviwed
International conference proceedings, English

高速フリッカ連続提示による瞬き知覚(日本基礎心理学会第31回大会,大会発表要旨)
中嶋 豊; 阪口 豊
基礎心理学研究, 日本基礎心理学会, 31, 2, 215-215, 2013
Japanese

Both movement-end and task-end are critical for error feedback in visuomotor adaptation: A behavioral experiment
Ishikawa, T; Sakaguchi, Y
PLoS ONE, 8, 2, e55801, Jan. 2013, Peer-reviwed
Scientific journal, English

Mechanism of body operation in Japanese classical material arts: Motion analysis of quiet standing and walking
Inoue, Y; Sakaguchi, Y
Proceedings of the 27th Symposium on Biological and Physiological Engineering (BPES2012), 185-190, Sep. 2012
International conference proceedings, English

Relationship between the alpha-band EEG waves observed at frontal, parietal and occipital scalps
Shiga, K; Sakaguchi, Y
Proceedings of the 26th Symposium on Biological and Physiological Engineering (BPES2011), 530-536, Sep. 2011, Peer-reviwed
International conference proceedings, English

Audiolizing body movement: Its concept and application to motor skill learning
Naoyuki Houri; Hiroyuki Arita; Yutaka Sakaguchi
ACM International Conference Proceeding Series, #13, 2011, Peer-reviwed, We propose a concept of "audiolization of body movement," which transforms the posture/movement of the human body or human-controlled-tools into acoustic signals and feeds them back to the users in a real-time manner. It aims at helping people being aware of their body/tool states, and resultantly assisting their motor skill learning. The present paper describes features of the concepts and introduces some demonstrative applications. Copyright 2011 ACM.
International conference proceedings, English

Visual Information of Endpoint Position Is Not Required for Prism Adaptation of Shooting Task
Takumi Ishikawa; Yutaka Sakaguchi
NEURAL INFORMATION PROCESSING, PT III, SPRINGER-VERLAG BERLIN, 7064, 95-102, 2011, Peer-reviwed, Humans can easily adapt to a visually distorted environment: We can make correct movements after a few dozens of actions with visual guidance in the new environment. However, it is unclear what visual information our brain uses for this visuo-motor adaptation. To answer this question, we conducted a behavioral experiment of prism adaption of a ball shooting task, with manipulating visual information of the ball. We found that prism adaptation occurred when the position of ball impact (or endpoint) was not visually presented. A similar result was replicated in a modified experimental setup where the vision of the body was completely eliminated. These results imply that the error information at the time of hit/impact (i.e., the displacement between the target and the hit position) is not required for prism adaptation. This suggests that the visual information of on-the-fly ball trajectory can be utilized for prism adaptation.
International conference proceedings, English

Time Course of Information Representation of Macaque AIP Neurons in Hand Manipulation Task Revealed by Information Analysis
Yutaka Sakaguchi; Fumihiko Ishida; Takashi Shimizu; Akira Murata
JOURNAL OF NEUROPHYSIOLOGY, AMER PHYSIOLOGICAL SOC, 104, 6, 3625-3643, Dec. 2010, Peer-reviwed, Sakaguchi Y, Ishida F, Shimizu T, Murata A. Time course of information representation of macaque AIP neurons in hand manipulation task revealed by information analysis. J Neurophysiol 104: 3625-3643, 2010. First published October 13, 2010; doi:10.1152/jn.00125.2010. We used mutual information analysis of neuronal activity in the macaque anterior intraparietal area (AIP) to examine information processing during a hand manipulation task. The task was to reach-to-grasp a three-dimensional (3D) object after presentation of a go signal. Mutual information was calculated between the spike counts of individual neurons in 50-ms-wide time bins and six unique shape classifications or 15 one-versus-one classifications of these shapes. The spatiotemporal distribution of mutual information was visualized as a two-dimensional image ("information map") to better observe global profiles of information representation. In addition, a nonnegative matrix factorization technique was applied for extracting its structure. Our major finding was that the time course of mutual information differed significantly according to different classes of task-related neurons. This strongly suggests that different classes of neurons were engaged in different information processing stages in executing the hand manipulation task. On the other hand, our analysis revealed the heterogeneous nature of information representation of AIP neurons. For example, "information latency" (or information onset) varied among individual neurons even in the same neuron class and the same shape classification. Further, some neurons changed "information preference" (i.e., shape classification with the largest amount of information) across different task periods. These suggest that neurons encode different information in the different task periods. Taking the present result together with previous findings, we used a Gantt chart to propose a hypothetical scheme of the dynamic interactions between different types of AIP neurons.
Scientific journal, English

Kalman filter model can explain the temporal receptive field of motion selective V1 neurons
Shunji Satoh; Yutaka Sakaguchi; Hiroaki Sasaki; Shiro Usui
NEUROSCIENCE RESEARCH, ELSEVIER IRELAND LTD, 68, E379-E380, 2010, Peer-reviwed
International conference proceedings, English

Reinforcement-learning agents with different temperature parameters explain the variety of human action-selection behavior in a Markov decision process task
Fumihiko Ishida; Takahiro Sasaki; Yutaka Sakaguchi; Hiroyuki Shimai
NEUROCOMPUTING, ELSEVIER SCIENCE BV, 72, 7-9, 1979-1984, Mar. 2009, Peer-reviwed, We investigated the characteristics of the human action-selection in performing a Markov decision process (MDP) task, and compared them to those of reinforcement-learning (RL) agents. The behavior of human participants was roughly classified into two qualitatively different types. On the other hand, surprisingly, the variety of human behavior could be explained simply by a single parameter of the degree of randomness (i.e., the temperature parameter) in the action-selection rules of the RL agents. This result implies that the various behaviors of human action-selection may be determined by a simple mechanism in the brain. (c) 2008 Elsevier B.V. All rights reserved.
Scientific journal, English

Motor planning as an optimization of command representation
Shiro Ikeda; Yutaka Sakaguchi
Proceedings of the IEEE Conference on Decision and Control, 4499-4504, 2009, Peer-reviwed, A fundamental problem in the field of motor neuroscience is to understand how our brain generates appropriate motor commands for precise movements effortlessly. The problem seems difficult since there are infinitely many possible trajectories and our musculo-skeltal system is generally redundant. We focus on the motor command representation and show that a simple strategy can solve the problem for a planar two-joints arm model. We also discuss the emergence of the muscle synergies, which may enable us to make natural motor behaviors with smaller degrees of freedom. ©2009 IEEE.
International conference proceedings, English

A computational model of perceptual grouping and 3D surface completion in the mime effect
Riadh Mtibaa; Masanori Idesawa; Yutaka Sakaguchi; Fumihiko Ishida
NEURAL NETWORKS, PERGAMON-ELSEVIER SCIENCE LTD, 21, 7, 936-944, Sep. 2008, Peer-reviwed, We propose a computational model of perceptual grouping for explaining the 3D shape representation of an illusory percept called "mime effect." This effect is associated with the generation of an illusory, volumetric perception that can be induced by particular distributions of inducing stimuli such as cones, whose orientations affect the stability of illusory perception. The authors have attempted to explain the characteristics of the shape representation of the mime effect using a neural network model that consists of four types of cells-encoding (E), normalizing (N), energetic (EN), and geometric (G) cells. E cells represent both the positions and orientations of inducing stimuli and the mime-effect shape, and N cells regulate the activity of E cells. The interactions of E cells generate dynamics whose mode indicates the stability of illusory perception; a stable dynamics mode indicates a stable perception, whereas a chaotic dynamics mode indicates an unstable perception. EN cells compute the Liapunov energetic exponent (LEE) from an energy function of the system of E cells. The stable and chaotic dynamics modes are identified by strictly negative and strictly positive values of LEE, respectively. In case of stability, G cells perform a particular surface interpolation for completing the mime effect shape. The authors confirm the model behaviour by means of computer-simulated experiments. The relation between the model behaviour and the shape representation in the human brain is also discussed. (C) 2008 Elsevier Ltd. All rights reserved.
Scientific journal, English

A system model for real-time sensorimotor processing in brain
Yutaka Sakaguchi
NEURAL INFORMATION PROCESSING, PART I, SPRINGER-VERLAG BERLIN, 4984, 1120-1129, 2008, Peer-reviwed, The present paper addresses a general diagram to investigate the real-time parallel computation mechanism in the brain, using an idea of "Gantt chart." This diagram explicitly represents the temporal relationship between the computations running in various functional modules in the brain, and helps us to understand how the brain computation proceeds along the time. The author illustrates how we can utilize this diagram, taking a motor planning model of reaching movement as an example. Moreover, the author discusses the mechanism of intra- and inter-module computations on this diagram and addresses a tentative view that can explain the relationship between the movement variability and reaction time.
International conference proceedings, English

低い時間解像度の運動指令がもたらす手先軌道の性質：運動指令表現の単純化仮説
阪口 豊; 和田克巳
電子情報通信学会論文誌, J91-D, 2368-2381, 2008, Peer-reviwed
Scientific journal, Japanese

Muscle synergies extracted from human grasping movements
Fumihiko Ishida; Kazuyuki Karatsu; Yutaka Sakaguchi
International Congress Series, 1301, 110-113, Jul. 2007, Peer-reviwed, The concept of "muscle synergies" has been proposed as a working hypothesis to explain how the central nervous system coordinates the numerous degrees of freedom of the musculoskeletal system. In this study, to examine this hypothesis, we extracted muscle synergies from human electromyography (EMG) patterns during grasping movements. The EMG patterns observed in movements to achieve different goal postures and execution times were represented by combinations of the same set of synergies. © 2006.
Scientific journal, English

Motor planning and sparse motor command representation
Yutaka Sakaguchi; Shiro Ikeda
Neurocomputing, 70, 10-12, 1748-1752, Jun. 2007, Peer-reviwed, The present article proposes a novel computational approach to the motor planning. In this approach, each motor command is represented as a linear combination of prefixed basis patterns, and the command for a given task is designed by minimizing a two-termed criterion consisting of a task optimization term and a parameter preference (i.e., sparseness) term. The result of a computer simulation with a single-joint reaching task confirmed that our "representation-based" criterion for motor planning appropriately worked, together with showing that the resultant trajectory qualitatively replicated Fitts' law. © 2006 Elsevier B.V. All rights reserved.
Scientific journal, English

Repetitive firing of a model motoneuron: Inhibitory effect of a Ca2+-activated potassium conductance on the slope of the frequency-current relationship
Katsumi Wada; Yutaka Sakaguchi
NEUROSCIENCE RESEARCH, ELSEVIER IRELAND LTD, 57, 2, 259-267, Feb. 2007, Peer-reviwed, We developed a novel motoneuron model to examine the role of voltage-independent, Ca2+-activated potassium conductance (AHP conductance. or gAHP) in regulating repetitive firing. In addition to gAHP, the model also includes five voltage-gated conductances and a system that can reproduce Ca2+ dynamics in the cytoplasm. Conductance kinetics were based on empirical data, and the model reproduced the piecewise linear. steady-state frequency-current relationship (f-I curve). The model revealed that gAHP has a "braking effect" that suppresses spike generation and thereby reduces firing frequency; the magnitude of the reduction in firing frequency is proportional to the temporal average of gAHP activation; and the level of activation depends on the magnitude of the injected current. Moreover, plotting the activation level as a function of injected current produced a bell-shaped curve, and this relationship was essential to the transition of the f-l curve. In conclusion, our study confirms the importance of gAHP to repetitive firing and presents a novel explanation for the piecewise linear f-I curve of motoneurons. (c) 2006 Elsevier Ireland Ltd and the Japan Neuroscience Society. All rights reserved.
Scientific journal, English

Contrast dependency in perceptual filling-in
Yutaka Sakaguchi
VISION RESEARCH, PERGAMON-ELSEVIER SCIENCE LTD, 46, 20, 3304-3312, Oct. 2006, Peer-reviwed, Two experiments were conducted to investigate how stimulus contrast affected the time required for perceptual filling-in. The stimuli consisted of a Gabor patch (target) and a circular grating region (surround). In Experiment 1, the target contrast was manipulated, and the surround contrast was fixed. Filling-in was significantly delayed with higher target contrast, but this delay was observed only when the target contrast exceeded the surround contrast. In Experiment 2, however, a much smaller effect of changing the surround contrast occurred. Possible reasons for this asymmetric effect are discussed. (c) 2006 Elsevier Ltd. All rights reserved.
Scientific journal, English

Adaptive acquisition of dynamics matching in sensory-motor fusion system
N Ogawa; Y Sakaguchi; A Namiki; M Ishikawa
ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE, SCRIPTA TECHNICA-JOHN WILEY & SONS, 89, 7, 19-30, 2006, Peer-reviwed, "Dynamics matching" is a design concept in sensory-motor fusion systems, where the performance is maximized by ad adjustment of the dynamics of the system under the physical and computational constraints. This paper models dynamics matching as all optimization problem and constructs an adaptive acquisition algorithm. A numerical experiment on the target-tracking task using active vision is presented as an example, and it is shown that a reasonable Solution is acquired by the proposed approach. (c) 2006 Wiley Periodicals, Inc.
Scientific journal, English

The minimum endpoint variance trajectory depends on the profile of the signal-dependent noise
N Iguchi; Y Sakaguchi; F Ishida
BIOLOGICAL CYBERNETICS, SPRINGER, 92, 4, 219-228, Apr. 2005, Peer-reviwed, It has been proposed that the central nervous system determines reaching movement trajectories so as to minimize the positional variance of the endpoint in the presence of signal-dependent noise. The hypothesis well reproduces the empirical movement trajectories for noise to the control signal whose variance is proportional to the second power of the amplitude of the control signal. However, empirical studies do not necessarily exhibit such a simple signal-noise relationship. The studies exhibit a wide distribution of estimates of the value of the exponent. This discrepancy raises the question of how the minimum endpoint variance trajectory depends on the value of the exponent. To address this question, we calculated minimum endpoint variance trajectories in simulations in which the value of the exponent was varied from 0 to 3. We found that the optimal trajectories differed according to the value of the exponent, and the profiles of optimal trajectories gradually diverged from the empirical ones as the value approached 0, though this change was not remarkable for larger values. Moreover, the optimal trajectories failed to replicate Fitts' law when the value was not equal to 2. These results suggest that the acceptability of the minimum endpoint variance theory depends on the value of the exponent in our motor system.
Scientific journal, English

Reliability of internal prediction/estimation and its application. I. Adaptive action selection reflecting reliability of value function
Y Sakaguchi; M Takano
NEURAL NETWORKS, PERGAMON-ELSEVIER SCIENCE LTD, 17, 7, 935-952, Sep. 2004, Peer-reviwed, This article proposes an adaptive action-selection method for a model-free reinforcement learning system, based on the concept of the reliability of internal prediction/estimation'. This concept is realized using an internal variable, called the Reliability Index (RI), which estimates the accuracy of the internal estimator. We define this index for a value function of a temporal difference learning system and substitute it for the temperature parameter of the Boltzmann action-selection rule. Accordingly, the weight of exploratory actions adaptively changes depending on the uncertainty of the prediction. We use this idea for tabular and weighted-sum type value functions. Moreover, we use the RI to adjust the learning coefficient in addition to the temperature parameter, meaning that the reliability becomes a general basis for meta-learning. Numerical experiments were performed to examine the behavior of the proposed method. The RI-based Q-learning system demonstrated its features when the adaptive learning coefficient and large RI-discount rate (which indicate how the RI values of future states are reflected in the RI value of the current state) were introduced. Statistical tests confirmed that the algorithm spent more time exploring in the initial phase of learning, but accelerated learning from the midpoint of learning. It is also shown that the proposed method does not work well with the actor-critic models. The limitations of the proposed method and its relationship to relevant research are discussed. (C) 2004 Elsevier Ltd. All rights reserved.
Scientific journal, English

パルス型神経細胞モデルに基づくsignal dependent noise生成機構の検討
井口尚彦; 阪口 豊; 石田文彦
電子情報通信学会論文誌, J87-D-II, 1851-1859, 2004, Peer-reviwed
Scientific journal, Japanese

感覚運動統合システムにおけるダイナミクス整合の適応的獲得
尾川順子; 阪口 豊; 並木明夫; 石川正俊
電子情報通信学会論文誌, J87-D-II, 1505-1515, 2004, Peer-reviwed
Scientific journal, Japanese

生体ノイズ特性に基づく終点分散最小規範の再検討
井口尚彦; 阪口 豊; 石田文彦
電子情報通信学会論文誌, J87-D-II, 999-1007, 2004, Peer-reviwed
Scientific journal, Japanese

Visual field anisotropy revealed by perceptual filling-in
Y Sakaguchi
VISION RESEARCH, PERGAMON-ELSEVIER SCIENCE LTD, 43, 19, 2029-2038, Sep. 2003, Peer-reviwed, Four experiments were performed to investigate how the time required for perceptual filling-in varies with the position of the target in the visual field. Conventional studies have revealed that filling-in is facilitated by a target with greater eccentricity, while no systematic studies have examined the effect of polar angle. Experiment I examined the effect of polar angle when the target and surround differed in luminance. Filling-in was facilitated as the target position changed from the horizontal to the vertical meridian. This dependency was more prominent in the upper field than in the lower, although no asymmetry was found between the left and right visual fields. These features were observed in both monocular and binocular, viewing. These results were replicated in a modified stimulus configuration, in which the surround was a circular region concentric with the target (Experiment 2). Moreover, it was confirmed that the asymmetry was not due to fluctuation in the retinal image (i.e., eye movement) (Experiment 3). Finally, Experiment 4 examined whether this anisotropy was observed when two differently oriented gratings were presented in the target and surround regions. Again, filling-in was facilitated for a target close to the vertical meridian, irrespective of the relationship between the target and surround orientations. The underlying mechanism of this anisotropy is discussed from the viewpoints of cortical magnification and neural connections in the visual cortex. (C) 2003 Elsevier Ltd. All rights reserved.
Scientific journal, English

A dynamical model of figure-ground reversal perception based on the role of visual attention
Yasukochi, K; Sakaguchi, Y
System and Communication in Japan, 33, 10, 21-30, Oct. 2002, Peer-reviwed
Scientific journal, English

Visuo-motor adaptation to stepwise and gradual changes in the environment: Relationship between consciousness and adaptation
Sakaguchi, Y; Akashi, Y; Takano, M
Journal of Robotics and Mechatronics, 13, 601-613, Dec. 2001, Peer-reviwed
Scientific journal, English

Learning to Switch Behaviors for Dierent Environments: A Computational Model for Incremental Modular Learning
Y. Sakaguchi; M. Takano
Proceedings of IEEE NOLTA-2001, 383-386, Oct. 2001
International conference proceedings, English

Target/surround asymmetry in perceptual filling-in
Y Sakaguchi
VISION RESEARCH, PERGAMON-ELSEVIER SCIENCE LTD, 41, 16, 2065-2077, Jul. 2001, Peer-reviwed, Four experiments examined how differences in the properties of the target and surround affect the time required for perceptual filling-in. They examined differences in luminance, orientation, spatial frequency, and color. A larger target/surround difference delayed filling-in ('feature difference effect'). Interestingly, exchanging the target and surround properties significantly varied the time ('target/surround asymmetry'). Filling-in was facilitated when the target was brighter and closer to the vertical or horizontal than the surround. Little asymmetry was found in the frequency domain, while significant asymmetry was observed for specific color combinations. These effects are discussed with respect to edge adaptation, feature adaptation, balance of neural activities, and contextual modulation. (C) 2001 Elsevier Science Ltd. All rights reserved.
Scientific journal, English

注意の動きに着目した図地反転知覚のモデル
安河内 建; 阪口 豊
電子情報通信学会論文誌, J84-D-II, 1485-1494, 2001, Peer-reviwed
Scientific journal, Japanese

Pantomime effect in the perception of volumetrical transparent illusory object with binocular viewing
Q Zhang; M Idesawa; Y Sakaguchi
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, JAPAN J APPLIED PHYSICS, 37, 3B, L329-L332, Mar. 1998, Peer-reviwed, Transparency and volume perception are important issues in 3-D object perception. We report here a new visual effect in 3-D illusory object perception with binocular viewing, named 'pantomime effect', and introduce a new framework of the effect based on three types of 'sustaining cues'. We also compare sustaining cues with occlusion cues. In addition, the perception of transparent and volumetrical objects was verified by the experiments using another illusory probe stimulus. It was also found that side sustaining cues played an essential role in volume perception, and the transparency in pantomime effect was different from that in multilayer transparent planes depicted by a random dot stereogram.
Scientific journal, English

内部モデルの信頼度に基づく運動計画のアルゴリズム
阪口 豊
電子情報通信学会論文誌, The Institute of Electronics, Information and Communication Engineers, J79-D-II, 2, 248-256, Feb. 1996, Peer-reviwed, 人間の運動計画が運動に慣れるに従って変化することに着目し, 適応の進行に応じて適切な運動指令を生成する運動計画のアルゴリズムを構成した. 本アルゴリズムは, 運動に不慣れな間は誤りをおかさないように小さな運動指令を出力し, 運動に慣れるに従って大きな運動指令を出力するものである. 本アルゴリズムを定式化する上で, 適応の進み具合をシステム内部で評価する「内部モデルの信頼度」という概念が重要な役割を果たす. 本論文では, まず一般的なアルゴリズムを確率モデルに基づいて記述したのち, 具体的な例題として図形の縁をなぞる運動を取り上げ, 提案したアルゴリズムがこの課題を実行する際の人間の振舞いをうまく模擬することを数値実験によって示す. また, 考察として, 提案したアルゴリズムと従来の軌道計画, 学習制御モデルとの関係や, 随意運動遂行における感覚情報獲得のメカニズムについて議論する.
Scientific journal, Japanese

能動的感覚統合による触知覚認識システム
阪口 豊
計測自動制御学会論文集, 31, 8, 1217-1226, Aug. 1995, Peer-reviwed
Scientific journal, Japanese

An attentional perception algorithm with prediction
阪口 豊
Journal of Robotics Society of Japan, 12, 5, 708-714, May 1994, Peer-reviwed
Scientific journal, Japanese

Haptic recognition system with sensory integration and attentional perception
Y SAKAGUCHI; K NAKANO
MFI '94 - 1994 IEEE INTERNATIONAL CONFERENCE ON MULTISENSOR FUSION AND INTEGRATION FOR INTELLIGENT SYSTEMS, I E E E, 288-295, 1994, Peer-reviwed
International conference proceedings, English

HAPTIC SENSING SYSTEM WITH ACTIVE PERCEPTION
Y SAKAGUCHI
ADVANCED ROBOTICS, VSP BV, 8, 3, 263-283, 1994, Peer-reviwed, Human haptic perception is not caused by simple mechanical stimulation to the skin; it is achieved by integrating sensory information from various receptors (such as mechano-receptors and thermo-receptors) and by observing objects in various ways. The author constructed sensing systems which simulate human haptic processes in order to clarify the mechanism of such sensory integration and active perception. In this article, first the author formalizes these processes from a theoretical point of view and constructs an 'intentional observation' algorithm on the basis of that formalization. This algorithm is to select appropriate sensors from many sensors based on information criteria to recognize objects mom accurately by fewer observations. Second, the author describes two kinds of haptic sensing systems which recognize objects' materials and surface textures utilizing actively several sensor devices, and shows that the proposed algorithm is effective in these actual systems. Some related problems are also discussed.
Scientific journal, English

MOTOR PLANNING ACCORDING TO RELIABILITY OF INTERNAL MODEL
Y SAKAGCHI; K NAKANO
IJCNN '93-NAGOYA : PROCEEDINGS OF 1993 INTERNATIONAL JOINT CONFERENCE ON NEURAL NETWORKS, VOLS 1-3, I E E E, 1321-1324, 1993, Peer-reviwed
International conference proceedings, English

Representing and Recognizing Figures Based on Constraints from the External World
阪口豊; 中野馨
計測自動制御学会論文集, The Society of Instrument and Control Engineers, 28, 3, 392-400, 1992, Peer-reviwed, When perceiving an object, human beings can construct its internal image from its fragmental features and recognize it based on the image, without observing it all over. In this article, the authors propose a neural network model which constructs internal representation of a given figure and recognizes it based on the representation.
The model consists of a sensory unit, a figure representation field and a recognition layer. The model moves the sensory unit and observes a local feature of the figure. The figure representation field consists of many "feature units", whose activation represents the figure. These units interact through mutual connections which reflect topological structure of the external world. Through the interaction, the field constructs global representation of the figure from the local features observed by the sensory unit.
The recognition layer makes a recognition output using the field activation. It means that the recognition is based not on sensory information itself but on internal representation modulated by the field dynamics. This "internal-representation-based recognition" bears an aspect of human recognition. By imposing external input reflecting "context" to the field, for instance, "contextdependent recognition" is realized.
In addition, the authors propose an active searching algorithm which helps representation construction to advance smoothly. In the course of construction, competition often arises between feature units, especially around edges or corners of the figure, which have significant meaning for constructing the representation. The model can observe "intentionally" such essential parts by moving the sensory unit to the corresponding position. Such competition-invoked searching is a new algorithm for active perception.
The model behavior is investigated through computer simulation. Some related matters on representation in the brain are discussed.
Scientific journal, Japanese

Figune Recognition with Intentional Observation
Yutaka Sakaguchi; Kaoru Nakano
Proceedings of IJCNN-92-Baltimore, 792-797, 1992, Peer-reviwed
International conference proceedings, English

ACTIVE PERCEPTION WITH INTENTIONAL OBSERVATION
Y SAKAGUCHI; K NAKANO
ISMCR 92 : PROCEEDINGS OF THE SECOND INTERNATIONAL SYMPOSIUM ON MEASUREMENT AND CONTROL IN ROBOTS, SOC INSTRUMENT & CONTROL ENGINEERS JAPAN, 241-248, 1992, Peer-reviwed
International conference proceedings, English

TOPOGRAPHIC ORGANIZATION OF NERVE FIELD WITH TEACHER SIGNAL
Y SAKAGUCHI
NEURAL NETWORKS, PERGAMON-ELSEVIER SCIENCE LTD, 3, 4, 411-421, 1990, Peer-reviwed
Scientific journal, English

教師信号を伴った神経場のトポグラフィックな自己組織化
阪口 豊; 中野 馨
電子情報通信学会論文誌, 電子情報通信学会情報・システムソサイエティ, J72-DII, 5, p782-791, 1989, Peer-reviwed
Scientific journal, Japanese

SELF-ORGANIZING SYSTEM OBTAINING COMMUNICATION ABILITY - PRIMITIVE MODEL FOR LANGUAGE GENERATION
K NAKANO; Y SAKAGUCHI; R ISOTANI; T OHMORI
BIOLOGICAL CYBERNETICS, SPRINGER VERLAG, 58, 6, 417-425, 1988, Peer-reviwed
Scientific journal, English

一方向高速運動刺激における運動軌道の知覚的短縮
中嶋豊; 阪口豊
Jun. 2017, 光学, 46, 6, 247, Japanese, Invited, Introduction scientific journal

2016年度日本神経回路学会論文賞の研究概要
阪口 豊
日本神経回路学会, Mar. 2017, 日本神経回路学会誌, 24, 1, 47-50, Japanese, Invited, Book review

An analysis of breath timing in piano playing
Yutaka Sakaguchi; Eriko Aiba
Sep. 2015, Abstracts of the International Symposium on Performance Science 2015, 115-115, English, Peer-reviwed, Summary international conference

Perceived speed of apparent motion in high-speed conditions
Yutaka Nakajima; Yutaka Sakaguchi
PION LTD, 2014, I-PERCEPTION, 5, 4, 328-328, English, Summary international conference, 2041-6695, WOS:000342373600125

Abrupt transition between an above-CFF flicker and a stationary stimulus induces twinkle perception: Evidence for high-speed visual mechanism for detecting luminance change.
Nakajima, Y; Sakaguchi, Y
Jul. 2013, Journal of Vision, 13, 9, article 311, English

エアホッケープレイヤの動作解析 ～対戦相手の反応を誘発する運動手がかりの探求～
三反畑努; 中嶋豊; 阪口豊
2013, 信学技報, 113, 500, 263-267

Increasing the magnitude of luminance gap between high-speed flickers facilitates the transient twinkle perception
中嶋 豊; 阪口 豊
映像情報メディア学会, Nov. 2012, 映像情報メディア学会技術報告, 36, 46, 95-99, Japanese, 1342-6893, 40019540957, AN1059086X

高速フリッカ刺激の経時提示により生じる瞬き知覚は刺激間の輝度差に依存する．
中嶋豊; 阪口豊
2012, 信学技報, 112, 283, 95-99

Computational theory of V1 receptive fields and binocular vision
SATO SHUNJI; SAKAGUCHI YUTAKA; USUI SHIRO
一般社団法人電子情報通信学会, 02 Mar. 2010, 電子情報通信学会技術研究報告, 109, 461(NC2009 87-175), 391-396-396, Japanese, 0913-5685, 201002253887510111, 110008004332, AA1123312X

一般化Gaussian DerivativeによるV1受容野のモデル—両眼視差・運動方向選択性受容野モデルとそ工学的利点—
佐藤俊治; 臼井支朗; 阪口豊
24 Sep. 2009, 日本神経回路学会全国大会講演論文集, 19th, 120-121, Japanese, 200902233469868822

随意運動における運動指令パタンの創発，
阪口 豊
Jan. 2009, 計測と制御, 48, 1, 88-93, Japanese, Introduction other, 10031095055

Information analysis of neuronal activities in the monkey F5 and AIP areas during hand manipulation task
石田文彦; 村田哲; 阪口豊
We have analyzed neuronal activities of the monkey anterior intraparietal area (AIP) and ventral premotor cortex (F5) to reveal how the brain represents information related to hand manipulation. We calculated mutual information (MI) between activities of 122 single neurons and various clusters of 6 objects, and examined how MI changed dependent on different periods in hand manipulation task and the temporal relationship among the information processings in these neurons. The result of this analysis gives us a clue to understand the information stream in the AIP and F5 areas during visumomotor transformation., 一般社団法人電子情報通信学会, 16 Oct. 2008, 電子情報通信学会技術研究報告, 108, 264(NC2008 36-58), 43-48, Japanese, 0913-5685, 200902222366067862, 110007100588

書評「脳科学のテーブル」
阪口 豊
Japanese Neural Network Society, Sep. 2008, 日本神経回路学会誌, 15, 3, 240-241, Japanese, Introduction other, 1340-766X, 130000253746

ASCONE2007講義録「運動指令の表現と計画」
松嶋藻乃
Autumn School for Computational Neuroscience 2007（ASCONE2007）が2007年10月5日（金）～2007年10月8日（月）伊豆高原ルネッサ赤沢にて開催された．本稿は，三日目に行われた，電気通信大学の阪口豊先生の講演の講義録である．, Japanese Neural Network Society, Sep. 2008, 日本神経回路学会誌, 15, 3, 209-226, Japanese, Introduction other, 1340-766X, 10024274778, AA11658570

Information analysis of neuronal activities related to hand manipulation in monkey parietal area AIP
SHIMIZU Takashi; ISHIDA Fumihiko; MURATA Akira; SAKAGUCHI Yutaka
We analyzed neuronal activities of the monkey anterior intraparietal area (AIP) to reveal how the brain represents information related to hand manipulation. Here, we calculated mutual information (MI) between activities of 98 single neurons and various clusters of 6 objects, and examined how MI varied according to different task periods (i.e., fixation, reach and hold). We found that the different types of neurons (i.e., visual-, motor- and visuomotor-neurons) had significant information in different task periods. Moreover, we summed up MI for the populations of each type of neurons, which show temporal relationship among the information processings in different types of neurons. The result of this analysis gives us a novel clue to understand the information stream in the parietal area in sensory-motor control., The Institute of Electronics, Information and Communication Engineers, 05 Mar. 2008, IEICE technical report, 107, 542, 203-208, Japanese, 0913-5685, 110006783225

Information analysis of neuronal activities related to hand manipulation in the monkey parietal area AIP
Takashi Shimizu; Fumihiko Ishida; Akira Murata; Yutaka Sakaguchi
ELSEVIER IRELAND LTD, 2008, NEUROSCIENCE RESEARCH, 61, S61-S61, English, Summary international conference, 0168-0102, WOS:000261548100364

Information analysis of Monkey AIP neurons during hand manipulation task
清水崇司; 石田文彦; 村田哲; 阪口豊
17 Jul. 2007, 電子情報通信学会技術研究報告, 107, 157(NC2007 25-32), 1-6, Japanese, 0913-5685, 200902213019930330

Statistical analysis of neuronal activity during visual-motor task
清水 崇司; 石田 文彦; 阪口 豊
電気通信大学大学院情報システム学研究科ヒューマンインターフェース学講座, 02 Mar. 2007, Sensing and perception, 14, 29-32, Japanese, 40015537045, AA11846785

Information analysis of monkey AIP neurons during hand manipulation task
Takashi Shimizu; Fumihiko Ishida; Akira Murata; Yutaka Sakaguchi
ELSEVIER IRELAND LTD, 2007, NEUROSCIENCE RESEARCH, 58, S92-S92, English, Summary international conference, 0168-0102, WOS:000249272800539

打撃動作における関節スティフネスの能動的な調節 (電気通信大学 IS(大学院情報システム学研究科)シンポジウム 第13回「Sensing and Perception」)
柏手 章宏; 阪口 豊; 石田 文彦
電気通信大学大学院情報システム学研究科ヒューマンインターフェース学講座, 03 Mar. 2006, Sensing and perception, 13, 125-130, Japanese, 40015272090, AA11846785

地図を用いた家庭用ロボットのナビゲーション (電気通信大学 IS(大学院情報システム学研究科)シンポジウム 第13回「Sensing and Perception」)
加藤 有一; 阪口 豊; 石田 文彦
電気通信大学大学院情報システム学研究科ヒューマンインターフェース学講座, 03 Mar. 2006, Sensing and perception, 13, 1-4, Japanese, 40015272068, AA11846785

無線センサモジュールを用いた運動計測に関する研究--新たなスポーツデータ収集法の提案 (電気通信大学 IS(大学院情報システム学研究科)シンポジウム 第13回「Sensing and Perception」)
繁原 大輔; 阪口 豊; 石田 文彦
電気通信大学大学院情報システム学研究科ヒューマンインターフェース学講座, 03 Mar. 2006, Sensing and perception, 13, 109-114, Japanese, 40015272087, AA11846785

視線計測に関する研究 (電気通信大学 IS(大学院情報システム学研究科)シンポジウム 第12回「Sensing and Perception」)
溝尾 元洋; 阪口 豊; 石田 文彦
電気通信大学大学院情報システム学研究科ヒューマンインターフェース学講座, 25 Feb. 2005, Sensing and perception, 12, 11-14, Japanese, 40006886112, AA11846785

シナジーの概念に基づく運動指令の情報表現に関する研究 (電気通信大学 IS(大学院情報システム学研究科)シンポジウム 第12回「Sensing and Perception」)
唐津 一行; 石田 文彦; 阪口 豊
電気通信大学大学院情報システム学研究科ヒューマンインターフェース学講座, 25 Feb. 2005, Sensing and perception, 12, 69-76, Japanese, 40006886123, AA11846785

強化学習型タスクにおける人間の行動決定に関する研究 (電気通信大学 IS(大学院情報システム学研究科)シンポジウム 第12回「Sensing and Perception」)
佐々木 隆宏; 阪口 豊; 石田 文彦
電気通信大学大学院情報システム学研究科ヒューマンインターフェース学講座, 25 Feb. 2005, Sensing and perception, 12, 77-84, Japanese, 40006886124, AA11846785

上肢到達運動制御の計算モデルとその課題
阪口 豊
2004, Vision, 16, 93-110, Japanese, Introduction other, 10028077921

A Self-Organizing Reinforcement Learning System using Temporal Derivative of Learning Curve (2)
UCHIDA Kazuki; ISHIDA Fumihiko; SAKAGUCHI Yutaka
Learning proceeds efficiently when the ability of learning system matches to the difficulty of the problem to learn. The authors proposed a learning system which autonomously selected the problem to learn so that the performance improvement (i.e., temporal derivative of learning curve) was maximized. The present report focuses on the case that the state transition structure can be represented by binary-trees, and discusses the behavior of the proposed system in relation with the difficulty relation between various problems., The Institute of Electronics, Information and Communication Engineers, 12 Mar. 2003, IEICE technical report. Neurocomputing, 102, 731, 185-190, Japanese, 0913-5685, 110003232382, AN10091178

Learning of Dynamics Matching under Multiple Constraints
Naoko Ogawa; Yutaka Sakaguchi; Akio Namiki; Masatoshi Ishikawa
(in Japanese), Sep. 2001, Proceedings of The 19th Annual Conference of the Robotics Society of Japan 2001 (RSJ2001), 711-712, Japanese, Summary national conference, 200902142704110910

Dynamics-Consistency in Sensory-Motor Fusion and Its Acquisition by Reinforcement Learning
Yutaka Sakaguchi; Akio Namiki; Naoko Ogawa; Masatoshi Ishikawa
Jun. 2001, Proceedings of The 2nd Open Symposium on CREST "Creating the Brain" Research Area, 30, Japanese, Summary national conference

Sensory-Motor Fusion Based on Dynamics Matching : Learning of Strategies in Target Tracking Task
OGAWA Naoko; SAKAGUCHI Yutaka; NAMIKI Akio; ISHIKAWA Masatoshi
The authors propose a novel concept named "dynamics matching" for designing sensory-motor fusion system. This means a strategy to adjust adaptively the contents of the information processing and the control to maximize overall performance of the system under constraints such as restricted computational resources, physical properties of the sensor and motor systems and requirements by given tasks. The authors construct an algorithm utilizing reinforcement learning where the system performance is regarded as the "reward." The effect of the proposed concept is illustrated by a numerical experi..., 一般社団法人電子情報通信学会, 14 Mar. 2001, IEICE technical report. Neurocomputing, 100, 686, 47-54, Japanese, 0913-5685, 110003233813

多様な制約に対するダイナミクス整合の学習
尾川順子; 阪口豊; 並木明夫; 石川正俊
2001, 日本ロボット学会学術講演会予稿集, 19th, 200902177762472219

運動制御における高次の問題―到達運動と視覚運動変換を例にとって―
阪口 豊
Aug. 2000, 神経情報科学サマースクール（NISS2000）テキスト, 73-80, Japanese, Introduction other

A Model of Figure-Ground Reversal Perception Based on the Dynamical Role of Visual Attention
YASUKOCHI Ken; SAKAGUCHI Yutaka
The present study proposes a neural network model which tries to explain figure-ground reversal based on the dynamical characteristics of visual spatial attention. Most of the conventional models on figureground reversal was based on the oscillatiou between two patterns embedded in the network, and dealt with this phenomenon at the "symbolic level". In contrast, the present model has a field for representing, the 3D structure of an object and explains the phenomenon based on the dynamical change in the distribution of spatial attention on this field. The model behavior was examined through numerical experiments. This model is an example of an approach to visual perception based on the framework of "dynamics of attention and perception"., The Institute of Electronics, Information and Communication Engineers, 15 Mar. 2000, IEICE technical report. Neurocomputing, 99, 686, 205-212, Japanese, 0913-5685, 110003233700, AN10091178

注意の動きに注目した図地反転知覚のモデル
安河内 建; 阪口 豊
電気通信大学大学院・情報システム学研究科ヒュ-マンインタ-フェ-ス学講座, 03 Mar. 2000, Sensing and perception, 7, 131-138, Japanese, 40005138249, AA11846785

表現単純化の考えに基づく立体構造知覚のモデル
安河内 建; 阪口 豊
電気通信大学大学院・情報システム学研究科ヒュ-マンインタ-フェ-ス学講座, Mar. 1999, Sensing and perception, 6, 11-14, Japanese, 40005138211, AA11846785

センサフュージョンと感覚情報処理のモデル
阪口 豊
養賢堂, Apr. 1996, 機械の研究, 48, 4/5, 423-428,555-560-428, Japanese, Introduction other, 0368-5713, 40000587831, AN00349838

An Attentional Model for Control of Voluntary Movement
Sakaguchi Yutaka; Nakano Kaoru
When doing voluntary movements,human beings perceive the positions of targets and the states of their bodies through directing their eyes to proper locations on proper occasions.The authors propose a mathematical model of such an information acquisition mechanism in voluntary movements.The model calculates motor commands based on the internal models of the objects,and observes the objects when the internal models becomes less reliable than a required level.The results of numerical experiments show that the proposed model simulates the human behavior in a shape-tracing task., The Institute of Electronics, Information and Communication Engineers, 1994, IEICE technical report. Neurocomputing, 221-228, Japanese, 110003233307, AN10091178

感覚統合と能動的認識に関する工学的研究
阪口豊
1994, 博士論文, 東京大学工学部計数工学科, 10006766202

Sensory Integration and Active Perception in Haptics
阪口 豊
Nov. 1993, Journal of IEICE, 76, 11, 1222-1227, Japanese, Introduction other

Neural Network and Its Self-Organization
阪口 豊
1991, 計測と制御, 30, 4, 336-339, Japanese, Introduction other

Information Representation in Neural Networks
阪口 豊
1988, コンピュートロール, 24, Japanese, Introduction other

自由エネルギー原理入門: 知覚・行動・コミュニケーションの計算理論
乾敏郎; 阪口豊
Scholarly book, Japanese, Joint work, 全部, 岩波書店, 16 Nov. 2021

脳の大統一理論：自由エネルギー原理とは何か
乾敏郎; 阪口豊
General book, Japanese, Joint work, 岩波書店, 22 Dec. 2020, 9784000296991

Human-Harmonized Information Technology, Vol. 1
Ishikawa, M; Ishii, I; Sakaguchi, Y; Shimojo, M; Shinoda, H; Yamamoto, H; Komuro, T; Oku, H; Nakajima, Y; Watanabe, Y
Scholarly book, English, Joint work, Dynamic Information Space Based on High-Speed Sensor Technology, Springer, 2016, 9784431558651

日経サイエンス2007年11月号
阪口豊
Japanese, Single translation, 目の動きから心が見える, 日経サイエンス, 2007

脳の計算機構
阪口 豊
Japanese, Joint work, 運動制御における高次の問題－到達運動のプリズム適応を例にとって, 朝倉書店, 2005

脳の情報表現
阪口 豊; 樺島 祥介
Japanese, Joint work, 脳内情報表現への情報理論的アプローチ, 朝倉書店, 2002

Perceptrons
Minsky, Papert; 中野馨; 阪口豊 共
Japanese, Joint translation, パーソナルメディア, 1993

ニューロコンピュータの基礎
中野 馨; 阪口 豊; 森田昌彦; 新妻素直; 脇本良則; 田中宏一良; 藤田啓介; 衛作人
Japanese, Joint work, コロナ社, 1990

指揮動作の視覚情報の違いが演奏タイミングに及ぼす影響
Liu Meixuan; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ヒューマンコミュニケーション基礎研究会
03 Mar. 2024
02 Mar. 2024- 03 Mar. 2024

指揮動作の視覚情報の違いが演奏タイミングに及ぼす影響
Liu Meixuan; 阪口 豊
Poster presentation, Japanese, 日本視覚学会2024年冬季大会
18 Jan. 2024
17 Jan. 2024- 19 Jan. 2024

注意の働きを組み込んだ階層的学習運動制御モデル
高屋 真絵; 阪口 豊
Poster presentation, Japanese, 日本認知科学会第40回大会, Peer-reviewed
09 Sep. 2023

Effects of Rhythmic Changes on Preparatory Movements and Tempo Keeping Characteristics
Adachi, Y; Sakaguchi, Y; Nishii, J
Poster presentation, English, International Conference on Music Perception and Cognition (ICMPC2023), Peer-reviewed
27 Aug. 2023

Measuring Finger;Force onto Finger;Board by a;Sensor-Integrated Violin
Hamamoto, S; Sakaguchi, Y
Poster presentation, English, International Conference on Music Perception and Cognition (ICMPC2023), Peer-reviewed
27 Aug. 2023

A Measurement System of 3D Finger Force Applied to Piano Keys
Ishiguro, M; Sakaguchi, Y
Poster presentation, English, International Conference on Music Perception and Cognition (ICMPC2023), Peer-reviewed
25 Aug. 2023

Effects of Rhythm and Accent Patterns on Tempo Keeping Property of a Finger Tapping Task
Matsuo, H; Sakaguchi, Y
Poster presentation, English, International Conference on Music Perception and Cognition (ICMPC2023), Peer-reviewed
25 Aug. 2023

Harmonicity of periodic movements and beats in relation to kinematic characteristics
Tsubaki, Y; Sakaguchi, Y; Kuno-Mizumura, M
Poster presentation, English, International;Symposium on Performance Science (ISPS2023:), Peer-reviewed
19 Aug. 2023

構成音の立ち上がりのずれが和音の音色に与える影響
高山 稜平; 阪口 豊
Oral presentation, 映像情報メディア学会ヒューマンインターフェース研究会, HI2023-7
15 Mar. 2023

ヴァイオリン指板圧計測システムの構築
濵本 聖紀; 阪口 豊
Oral presentation, 映像情報メディア学会ヒューマンインターフェース研究会 HI2023-6
15 Mar. 2023

剣道の素振り動作における仮想的身体知覚に基づく教示の効果
荻野 勇人; 阪口 豊
Oral presentation, 電子情報通信学会ニューロコンピューティング研究会 NC2022-103
14 Mar. 2023

リズム変化が予備動作とテンポ維持特性に及ぼす影響
足達 優; 阪口 豊; 西井 淳
Oral presentation, Japanese, 情報処理学会音楽情報処理研究会, Domestic conference
15 Sep. 2022

脳の自由エネルギー原理との付き合い方
阪口 豊
Public discourse, Japanese, 第3回ニューロモルフィックAIハードウェア国際シンポジウム, Invited, Domestic conference
19 Mar. 2022

How to treat Free Energy Principle of Brain
Yutaka Sakaguchi
Public discourse, Japanese, the 3rd International Symposium on Neuromorphic AI Hardware, Domestic conference
19 Mar. 2022

運動課題における主観的規範の違いが 剣道の素振り動作にもたらす変化
荻野 勇人; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ニューロコンピューティング研究会, Domestic conference
02 Mar. 2022

課題の主観的捉え方の違いが身体運動に与える影響
阪口 豊
Poster presentation, Japanese, 日本認知科学会第38回大会論文集, Domestic conference
03 Sep. 2021

楽器演奏時における予備動作がテンポ維持に与える影響
足達 優; 阪口 豊; 西井 淳
Oral presentation, Japanese, 情報処理学会音楽情報処理研究会, Domestic conference
18 Jun. 2021

演奏指揮における身体動作の解析：時間情報伝達メカニズムの検討
山川望海; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ニューロコンピューティング研究会, Domestic conference
05 Mar. 2021

「骨で立つ」：機能的立位の実験的検討
田島寛之; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ニューロコンピューティング研究会, Domestic conference
05 Mar. 2021

クラシックバレエの巧さ判断を左右する運動学的要素 ～ 白鳥の羽ばたきを例にとって ～
細井 厚; 小島鼓児郎; 河野 由; 水村(久埜; 真由美; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ニューロコンピューティング研究会, Domestic conference
05 Mar. 2021

Incorporating cognitive process into computational motor control models---Towards an understanding of cognitive factors in executing motor skills
Yutaka Sakaguchi
Invited oral presentation, English, The 2nd International Symposium on Designing the Human-Centric IoT Society, Invited, Research Institute of Electrical Communication, Tohoku University, Remote, International conference
05 Dec. 2020

付加的情報フィードバックよる楽器演奏の練習支援 －ピアノ演奏におけるペダリング可視化－
阪口 豊
Poster presentation, Japanese, 日本認知科学会第37回大会論文集, Domestic conference
17 Sep. 2020

武術的立位が身体動揺に与える影響
渡部 悠也; 阪口 豊
Poster presentation, Japanese, 日本認知科学会第37回大会論文集, Domestic conference
17 Sep. 2020

課題の主観的捉え方の違いが身体運動に与える影響
畑野 圭佑; 阪口 豊
Poster presentation, Japanese, 日本認知科学会第37回大会論文集, Domestic conference
17 Sep. 2020

ストリートダンスにおける身体運動とビートの時間的関係性
上原 僚; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ニューロコンピューティング研究会, Domestic conference
04 Mar. 2020

ピアノ演奏における黒鍵接触タイミングの分析
市川裕駿; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ニューロコンピューティング研究会, Domestic conference
04 Mar. 2020

演奏情報のオンラインフィードバックによるピアノ練習支援システム
加宅田知; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ニューロコンピューティング研究会, Domestic conference
04 Mar. 2020

情報フィードバックの有効性を手がかりとした身体技能遂行過程の理解
阪口 豊
Invited oral presentation, Japanese, 日本認知科学会第36回大会論文集, Domestic conference
07 Sep. 2019

課題に対する捉え方の違いが身体運動に与える影響
畑野 圭佑; 阪口 豊
Invited oral presentation, Japanese, 日本認知科学会第36回大会論文集, Domestic conference
06 Sep. 2019

Humans Achieve Bayesian Optimality in Controlling Risk-Return Tradeoff of Spatial Reaching Task
Yao, Q; Sakaguchi, Y
Poster presentation, English, Proceedings of JNNS2019, International conference
04 Sep. 2019

Audiovisual synchrony perception for music and body movement
Uehara, T; Takehana, A; Sakaguchi, Y
Poster presentation, English, Proceedings of APCV2019, International conference
31 Jul. 2019

Bayesian Optimal Decision Making in Risk-Return Trade-off under Spatiotemporal Motor Variability
Yao, Q; Sakaguchi, Y
Poster presentation, English, Proceedings of APCV2019, International conference
30 Jul. 2019

音楽と身体運動の同期性知覚：ラジオ体操を題材とした実験的検討
竹花 瑛; 上原 僚; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ニューロコンピューティング研究会, Domestic conference
06 Mar. 2019

Perception of Synchronization between Music and Body Movements in Radio Calisthenics
Takehana, A; Uehara, T; Sakaguchi, Y
Poster presentation, English, Proceedings of JNNS2018, International conference
25 Oct. 2018

Temporal Relationship between Music and Body Movement in Radio Calisthenics
Uehara, T; Takehana, A; Sakaguchi, Y
Poster presentation, English, Proceedings of JNNS2018, International conference
25 Oct. 2018

Humans Achieve Bayesian Optimality in Controlling Risk-Return Tradeoff of Coincident Timing Task
Yao, Q; Sakaguchi, Y
Invited oral presentation, English, Proceedings of JNNS2018, International conference
25 Oct. 2018

「意識の働き」を組み込んだ感覚運動制御の計算モデル
阪口 豊
Invited oral presentation, Japanese, 日本認知科学会第35回大会論文集, Domestic conference
30 Aug. 2018

統計的学習に基づくピアニストの効率的な読譜
饗庭絵里子; 阪口 豊
Poster presentation, Japanese, 第12回Motor Control研究会, Domestic conference
20 Aug. 2018

ラジオ体操における音楽と身体運動の時間的関係性
上原 僚; 竹花 暎; 阪口 豊
Poster presentation, Japanese, 第12回Motor Control研究会, Domestic conference
19 Aug. 2018

音楽と身体運動の同期性知覚に関する実験的研究
竹花 暎; 上原 僚; 阪口 豊
Poster presentation, Japanese, 第12回Motor Control研究会, Domestic conference
19 Aug. 2018

リズムや強弱の時間パタンがテンポ維持特性に与える影響
永島亮誠; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ニューロコンピューティング研究会, Domestic conference
13 Mar. 2018

ラジオ体操における音楽と身体運動の時間的関係性
上原 僚; 竹花 瑛; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ニューロコンピューティング研究会, Domestic conference
13 Mar. 2018

複合的に運動する刺激を対象とした視覚探索特性の解析
本田秀明; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ニューロコンピューティング研究会, Domestic conference
13 Mar. 2018

Characteristics of simultaneous tapping by different hands/feet
Sato, Y; Sakai, K; Aiba, E; Sakaguchi, Y
Oral presentation, English, Proceedings of the 33rd Annual Meeting of the International Society for Psychophysics, International conference
25 Oct. 2017

楽器経験による調和性判断特性の違い
土江健太; 饗庭絵里子; 阪口豊
Oral presentation, Japanese, 日本音響学会秋季研究発表会講演論文集, Domestic conference
25 Sep. 2017

意識の働きを考慮した随意運動制御の計算論
阪口 豊
Poster presentation, Japanese, 生理研研究会2017 認知神経科学の先端 「意識の脳内メカニズム」, Domestic conference
25 Sep. 2017

主観的課題規範に依存した身体運動の協調関係の変化
阪口 豊
Poster presentation, Japanese, 第27回日本神経回路学会全国大会, Domestic conference
20 Sep. 2017

リズムパタンがテンポ維持特性に与える影響について
永島亮誠; 阪口 豊
Poster presentation, Japanese, 第11回Motor Control研究会, Domestic conference
26 Aug. 2017

課題実行時の主観的感覚が身体運動に与える影響
阪口 豊
Poster presentation, Japanese, 第11回Motor Control研究会, Domestic conference
26 Aug. 2017

Visual Information for Efficient Score Reading by Pianists
Aiba, E; Sakaguchi Y
Poster presentation, English, the International Symposium on Performance Science (ISPS-2017), International conference
Aug. 2017

ピアニストが効率的な読譜に用いる視覚的手がかり
饗庭絵里子; 阪口 豊
Oral presentation, Japanese, 第31回人工知能学会大会（JSAI-2017), Domestic conference
23 May 2017

身体の主観的分節構造が技能動作に与える影響
阪口 豊
Oral presentation, Japanese, 第31回人工知能学会大会（JSAI-2017), Domestic conference
23 May 2017

静止立位時の姿勢が動き出し動作の特性に与える影響
金井 涼; 石川裕一朗; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ヒューマン情報処理研究会, Domestic conference
10 Mar. 2017

武術における立位法の実験的検討 ～ 身体バランスに与える影響と接触相手との関係性の断ち切り ～
石川裕一朗; 金井 涼; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ヒューマン情報処理研究会, Domestic conference
10 Mar. 2017

高速ビジュアルトラッキングシステムによるピアノ演奏動作の解析
澤田一平; 饗庭絵里子; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ヒューマン情報処理研究会, Domestic conference
10 Mar. 2017

自発的な同時運動の特性と制御メカニズム ～ 同時運動の時間精度と同時性知覚の関係 ～
酒井香里; 佐藤好幸; 饗庭絵里子; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ヒューマン情報処理研究会, Domestic conference
10 Mar. 2017

マガーク効果の刺激依存性に関する検討
水梨勇河; 佐藤好幸; 饗庭絵里子; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ヒューマン情報処理研究会, Domestic conference
10 Mar. 2017

ピアノ演奏における触覚情報の役割：打鍵しない鍵盤がもたらす触力覚的手がかりの効果
饗庭絵里子; 阪口 豊
Poster presentation, Japanese, 第10回Motor Control研究会, Domestic conference
03 Sep. 2016

武術における立位バランスの実験的検討：「垂直離陸」による接触相手との関係性の断ち切り
石川裕一朗; 金井 涼; 阪口 豊
Poster presentation, Japanese, 第10回Motor Control研究会, Domestic conference
03 Sep. 2016

通常立位と中間重心立位からの前進動作の比較
金井 涼; 石川裕一朗; 阪口 豊
Poster presentation, Japanese, 第10回Motor Control研究会, Domestic conference
02 Sep. 2016

:武術における「離陸」のメカニズムの解明 ～ 相反する動作の拮抗が生み出す身体状態 ～
石川裕一朗; 金井 涼; 小幡哲史; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ニューロコンピューティング研究会, 電子情報通信学会, Domestic conference
22 Mar. 2016

静止姿勢における筋状態は直前の運動履歴に依存す
金井 涼; 石川裕一朗; 小幡哲史; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会ニューロコンピューティング研究会, 電子情報通信学会, Domestic conference
22 Mar. 2016

協和関係にある音程の判断精度の検討
野口知良; 饗庭絵里子; 阪口 豊; 小幡哲史; 佐藤好幸
Oral presentation, Japanese, 日本音響学会音楽音響研究会, Domestic conference
14 Mar. 2016

連続的な高速運動が知覚されるための時間条件について
中嶋 豊; 阪口 豊
Oral presentation, Japanese, 第49回知覚コロキウム, Domestic conference
Mar. 2016

An analysis of breath timing in piano playing
Sakaguchi, Y; Aiba, E
Poster presentation, English, the International Symposium on Performance Science (ISPS-2015), International conference
Sep. 2015

介助の質を高める介助者と被介助者の協調と相互理 解―日常的に介助を受ける障害当事者へのインタビューから―
武藤真理; 藤本幹; 阪口 豊
Oral presentation, Japanese, 日本認知科学会第 32回大会発表論文集, Domestic conference
Sep. 2015

ピアノ演奏中の呼吸タイミング
阪口 豊; 饗庭絵里子
Poster presentation, Japanese, 第9回Motor Control研究会, Domestic conference
Jun. 2015

Perception of transient pattern at the transition between high-speed flickering stimuli
Nakajima, Y; Sakaguchi, Y
Poster presentation, English, 15th Annual meeting of Vision Sciences Society (VSS), International conference
May 2015

ピアノ演奏中の呼吸タイミングの解析
阪口 豊; 饗庭絵理子
Oral presentation, Japanese, 電子情報通信学会技術研究報告,電子情報通信学会ニューロコンピューティング研究会, 電子情報通信学会, Domestic conference
17 Mar. 2015

Pattern perception brought by a transient switch of high-speed flicker stimuli
中嶋 豊; 阪口 豊
Poster presentation, English, 第48回知覚コロキウム, Domestic conference
Mar. 2015

高速フリッカ刺激の連続提示により生じるパタン知覚
中嶋 豊; 阪口 豊
Poster presentation, Japanese, 日本視覚学会2015年冬季大会, Domestic conference
Jan. 2015

Correlation of postural sways of two persons in contact and its dissolution by body operation of Japanese martial arts
Inoue, Y; Suzuki, T; Sakaguchi, Y
Poster presentation, English, Abastract of Neuro2014, Domestic conference
Sep. 2014

接触する二者間の重心動揺の同期は武術的身体操作によって解消される
井上康之; 阪口豊
Poster presentation, Japanese, 第８回モーターコントロール研究会, Domestic conference
Sep. 2014

Perceptual shrinkage of motion path observed in one-way high-speed motion.
Nakajima, Y; Sakaguchi, Y
Poster presentation, English, Japanese Neural Network Society 24th annual meeing, Domestic conference
Aug. 2014

Perceived speed of apparent motion in high-speed conditions
Nakajima, Y; Sakaguchi, Y
Poster presentation, English, Asia-Pacific Conference on Vision 2014 (APCV2014) annual meetin, International conference
Aug. 2014

良い介助動作をもたらす介助者の構え：被介助者へのインタビューによる検討
武藤 真理; 藤本 幹; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告,電子情報通信学会ニューロコンピューティング研究会, 電子情報通信学会, 岡山, Domestic conference
26 Jul. 2014

Factors of good assistance evaluated by an assistance receiver
Muto,M; Fujimoto,M; Sakaguchi, Y
Poster presentation, English, 16th International Congress of the World Federation of Occupational Therapists, International conference
Jun. 2014

武術的身体操作のダイナミクス ～ 接触する二者の重心動揺の同期とその解消 ～
鈴木友彦; 井上康之; 饗庭絵里子; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告,電子情報通信学会ニューロコンピューティング研究会, 電子情報通信学会, 東京, Domestic conference
18 Mar. 2014

エアホッケープレイヤの動作解析 ～ 対戦相手の反応を誘発する運動手がかりの探求 ～
三反畑 努; 中嶋 豊; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告,電子情報通信学会ニューロコンピューティング研究会, 電子情報通信学会, 東京, Domestic conference
18 Mar. 2014

Suggestive Evidence for a Forward Model of the Arm in the Monkey Motor Corte
Miyashita, E; Sakaguchi, Y
Oral presentation, English, IEEE 13th Workshop on Advanced Motion Control (AMC2014), International conference
Mar. 2014

古武術の特異的な身体操作に基づく立位姿勢と歩行動作の運動解析,
井上 康之; 阪口 豊
Poster presentation, Japanese, 第７回モーターコントロール研究会
Sep. 2013

A computational model explaining intermittent motor behavior observed in continuous tracking task
Sakaguchi, Y; Tanaka, M; Inoue, Y
Poster presentation, English, Proceedings of ICCN2013, Domestic conference
Jun. 2013

Intermittency of human motor behavior in target tracking depends on predictability of target motion
Inoue, Y; Sakaguchi, Y
Oral presentation, English, Abastract of Neuro2013
Jun. 2013

ウェーブレット解析を用いた運動間欠性の抽出手法の開発
井上 康之; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告,電子情報通信学会ニューロコンピューティング研究会
Mar. 2013

モデル予測制御に基づくヒトの目標追従運動の間欠的制御モデル
田中 雅人; 井上 康之; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告,電子情報通信学会ニューロコンピューティング研究会
Mar. 2013

身体運動の協調構造を利用した到達運動の先読みシステ
西田 泰明; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告,電子情報通信学会ニューロコンピューティング研究会
Mar. 2013

奏でる身体
甲野善紀; 白川真理; 阪口 豊
Others, Japanese
Feb. 2013

DLP 高速プロジェクタを用いた視覚心理実験環境の構築
中嶋 豊; 熊倉 啓; 阪口 豊
Oral presentation, Japanese, 日本視覚学会２０１３年冬季大会
Jan. 2013

高速フリッカ刺激の経時提示により生じる瞬き知覚は刺激間の輝度差に依存する
中嶋 豊; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Nov. 2012

高速フリッカ連続提示による瞬き知覚
中嶋 豊; 阪口 豊
Oral presentation, Japanese, 日本基礎心理学会第３１回大会
Nov. 2012

Error feedback is most effective both at movement end and at task end in visuo-motor adaptation of virtual shooting task
Ishikawa, T; Sakaguchi, Y
Oral presentation, English, The 35th Annual Meeting of the Japan Neuroscience Society
Sep. 2012

Temporal relationship between eye and hand movements during visuo-manual tracking task
Sakaguchi, Y; Inoue, Y
Oral presentation, English, Dynamic Brain Forum
Sep. 2012

連続的な手動追従課題の遂行時における眼球運動の協調的な振る舞い
井上 康之; 阪口 豊
Oral presentation, Japanese, 第５回Motor Control研究会,第５回Motor Control研究会
Jun. 2012

Intermittency in visual information acquisition in continuous tracking task
Inoue, Y; Sakaguchi, Y
Oral presentation, English, Annual Meeting of the Society for the Neural Control of Movement
Apr. 2012

ヒトの予測的な運動制御における視覚情報の効果
井上 康之; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2012

目標追従運動の間欠的制御モデル
田中 雅人; 浅野 哲理; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2012

打ち下ろし動作における最適運動パタンの探索
石野 智晴; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2012

準備動作の違いによる左右踏み出し運動の識別～全身運動の時間的構造に基づく行動の先読みに向けて～
西田 泰明; 藤原 祐介; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2012

床反力情報に基づく装着型ロボットによる起立補助
後藤 謙治; 香川 高弘; 宇野 洋二; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2012

連続的目標追従運動においてみられる運動制御の間欠性
阪口 豊
Oral presentation, Japanese, 第５回モーターコントロール研究会,第５回モーターコントロール研究会
Jun. 2011

Intermittent motor control observed in visuo-manual tracking
Sakaguchi, Y
Oral presentation, English, 34th Annual Meeting of Japanese Neuroscience Society
May 2011

視覚運動変換の適応ゲインは運動終了と課題終了の二つの誤差フィードバックタイミングにおいて異なるピークをとる
石川拓海; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告,ニューロコンピューティング研究会
Mar. 2011

多変量単位四元数のための因子分析モデル
藤原祐介; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告,ニューロコンピューティング研究会
Mar. 2011

前頭部と後頭部で計測されるα帯域脳波の関係について
志賀一雅; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告,MEとバイオサイバネティックス研究会
Mar. 2011

身体運動の可聴化: その概念と運動学習支援への応用
宝里 直幸; 有田 浩之; 阪口 豊
Oral presentation, Japanese, インタラクション２０１１資料集
Mar. 2011

追従腕運動において間欠性が生成されるメカニズム
浅野哲理; 井澤 淳; 阪口 豊
Oral presentation, Japanese, 第23回自律分散システム・シンポジウム資料
Jan. 2011

Effect of time difference between task-end and error-feedback on visuo-motor adaptation
Ishikawa, T; Sakaguchi, Y
Oral presentation, English, The 33rd Annual Meeting of the Japan Neuroscience Society
Sep. 2010

Kalman filter model can explain the temporal receptive field of motion selective V1 neurons
Satoh, S; Sakaguchi, Y; Sasaki, H; Usui, S
Oral presentation, English, The 33rd Annual Meeting of the Japan Neuroscience Society
Sep. 2010

視覚運動変換学習の誤差フィードバックに最適なタイミングは運動終了時か課題終了時か
阪口 豊; 石川 拓海
Oral presentation, Japanese, 第4回Motor Control研究会
Jun. 2010

誤差フィードバックのタイミングが視覚運動変換の適応に与える影響 -仮想投てき課題を用いた運動終了と課題終了の分離
石川 拓海; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告,ニューロコンピューティング研究会
Mar. 2010

V1細胞の受容野と視差選択性細胞に関する計算論的考察
佐藤 俊治; 阪口 豊; 臼井 支朗
Oral presentation, Japanese, 電子情報通信学会技術研究報告,ニューロコンピューティング研究会
Mar. 2010

感覚フィードバックと実時間性
阪口 豊
Public symposium, Japanese, 身体性情報学研究会, 電子情報通信学会, 調布
Dec. 2009

一般化Gaussian Derivative によるV1受容野モデル－両眼視差・運動方向選択性受容野モデルとその工学的利点
佐藤俊治; 臼井志朗; 阪口 豊
Oral presentation, Japanese, 日本神経回路学会第１９回全国大会講演論文集,日本神経回路学会
Sep. 2009

Effect of timing of error feedback on prism adaptation in a virtual shooting task
Ishikawa, T; Sakaguchi, Y
Oral presentation, English, The 32nd Annual Meeting of the Japan Neuroscience Society
Sep. 2009

サルF5-AIP野における手操作関連神経活動の情報量解析
石田 文彦; 村田 哲; 阪口 豊
Oral presentation, Japanese, 第3回Motor Control研究会,第3回Motor Control研究会
Jun. 2009

手操作運動中のサルF5-AIP 野神経活動の情報量解析
石田文彦; 村田哲; 阪口豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Oct. 2008

Bizzi, et al.(1984)の再検討：彼らの結果から何が結論できるのか？
阪口 豊; 石田 文彦; 宮下 英三
Oral presentation, Japanese, 日本神経回路学会,日本神経回路学会第18回全国大会講演論文集
Sep. 2008

同時活性化の機能的役割に関する一考察
阪口 豊
Oral presentation, Japanese, 計測自動制御学会,第23回生体生理工学シンポジウム論文集
Sep. 2008

"Audializing" Human Movements for Motor Skill Learning
Matsumura, K; Sakaguchi, Y
Oral presentation, English, 計測自動制御学会,Proc. SICE Annual Conference
Aug. 2008

手操作運動に関わるサルAIP野神経活動の情報量解析
清水 崇司; 石田 文彦; 村田 哲; 阪口 豊
Oral presentation, English, 日本神経科学学会,Neuro2008
Jul. 2008

後項根神経伝達の可逆的遮断のための埋め込み可能な冷却方式の提案
原 昌宏; 宮下 英三; 阪口豊
Oral presentation, English, 日本神経科学学会,Neuro2008
Jul. 2008

投擲運動のプリズム適応における視覚情報の効果：適応はボール着弾点の視覚情報が無くても生じる
石川 拓海; 阪口 豊
Oral presentation, English, 日本神経科学学会,Neuro2008
Jul. 2008

求心路の可逆的遮断のための冷却方法の提案
原 昌宏; 宮下 英三; 阪口 豊
Oral presentation, Japanese, 第2回Motor Control研究会資料集
Jun. 2008

サルAIP 野における手操作関連神経活動の情報量解析
石田 文彦; 清水 崇司; 村田 哲; 阪口 豊
Oral presentation, Japanese, 第2回Motor Control研究会資料集
Jun. 2008

手操作運動に関わるサルAIP野神経活動の情報量解析
清水崇司; 石田 文彦; 村田 哲; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2008

A system model for real-time sensorimotor processing in brain
Sakaguchi, Y
Oral presentation, English, International Conference on Neural Information Processing (ICONIP2007)
Nov. 2007

Role of visual information on prism adaptation of throwing movements: The eff ect of visual information of the thrown ball
Ishikawa, T; Sakaguchi, Y
Oral presentation, English, 日本神経科学学会，日本神経回路学会，日本神経化学会,Neuro2007
Sep. 2007

Why does the neuronal fi ring rate increase with a greater injected current?
Wada, K; Sakaguchi, Y
Oral presentation, English, 日本神経科学学会，日本神経回路学会，日本神経化学会,Neuro2007
Sep. 2007

Information analysis of Monkey AIP neurons during hand manipulation task
Shimizu, T; Ishida; F. Murata, A; Sakaguchi, Y
Oral presentation, English, 日本神経科学学会，日本神経回路学会，日本神経化学会,Neuro2007
Sep. 2007

手操作運動課題におけるサルAIP野ニューロンの情報量解析
清水崇司; 石田文彦; 村田哲; 阪口豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Jul. 2007

Temporal representation of arm dynamics in the primary motor cortex
Miyashita, E; Sakaguchi, Y; Komatsu, M
Public symposium, English, 10th Tamagawa-RIKEN Dynamic Brain Forum (DBF-07)
Mar. 2007

自動車加速時におけるアクセル操作の習熟過程のモデル化と実験的検討
渡邊 創; 大森 隆司; 山内 康一郎; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2007

技能獲得過程の計算モデル
田口 林太郎; 石田 文彦; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2007

投擲運動のプリズム適応における視覚情報の効果 - 投擲物の視覚情報が適応に与える影響
石川 拓海; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2007

運動指令の疎表現と運動計画 - 二関節非線形腕による到達運動への適用
阪口 豊; 池田 思朗
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2007

Repetitive firing of a model motoneuron: inhibitory effect of a Ca2+-activated potassium conductance on the slope of the frequency-current relationship2006.
Wada, K; Sakaguchi, Y
Oral presentation, English, Abstract of 36th Annual Meeting of Society for Neuroscience Annual Meeting (SFN-2006)
Oct. 2006

時間解像度の粗い運動指令が生み出す手先軌道の特徴
阪口 豊
Oral presentation, Japanese, 日本神経回路学会,第15回日本神経回路学会全国大会
Sep. 2006

日常動作の筋活動シナジー解析
石田 文彦; 阪口 豊
Oral presentation, Japanese, 日本神経回路学会,第16回日本神経回路学会全国大会
Sep. 2006

Muscle synergies extracted from human grasping movements,
Ishida, F; Karatsu, K; Sakaguchi, Y
Oral presentation, English, Abstracts of Brain-inspired Information Technology (BrainIT-2006)
Sep. 2006

Motor planning based on sparse command representation
Sakaguchi, Y; Ikeda, S
Oral presentation, English, Abstracts of Brain-inspired Information Technology (BrainIT-2006)
Sep. 2006

Some grouping effects observed in perceptual fading, Perception, 35, S77-78, 2006. (ECVP-2006)
Yoshino, D; Sakaguchi, Y
Oral presentation, English, Perception (ECVP-2006)
Aug. 2006

Information representation of neurons in the caudal part of the dorsal premotor cortex (PMdc)
Miyashita, E; Sakaguchi, Y; Komatsu, M
Oral presentation, English, 29th Annual Meeting of Japan Neuroscience Society
Jul. 2006

Motor planning and sparse motor command representation
Sakaguchi, Y; Ikeda, S
Oral presentation, English, Proceedings of Computational Neuroscience Meeting (CNS*2006)
Jul. 2006

Effects of feature changes of faded objects on its reently to our awareness
Yoshino, D; Sakaguchi, Y
Oral presentation, English, Proceedings of 6th Annual Meeting of Vision Sciences Society (VSS-2006)
May 2006

打撃動作における関節スティフネスの能動的な調節
柏手 章弘; 石田 文彦; 島井 博行; 和田 克己; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2006

運動指令の最適性に関する一考察 -タスク最適化とスパース表現-
阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2006

Movement variables represented by primary motor and caudal premotor cortical neurons
Miyashita, E; Sakaguchi, Y; Komatsu, M
Oral presentation, English, 35th Annual Meeting of Society for Neuroscience (SFN-2005)
Nov. 2005

時間スケーリングを含めた筋活動シナジーモデルとその抽出アルゴリズム
石田 文彦; 唐津 一行; 阪口 豊
Oral presentation, Japanese, 日本神経回路学会,第15回日本神経回路学会全国大会
Sep. 2005

タスク遂行最適化基準に基づく運動指令のシナジー分解
阪口 豊
Oral presentation, Japanese, 日本神経回路学会,第15回日本神経回路学会全国大会
Sep. 2005

Problems in estimating the exponent value of signal-dependent noise
Iguchi, N; Sakaguchi, Y; Komatsu, M; Miyashita, E
Oral presentation, English, Japan Neuroscience Society
Jul. 2005

Selectional preference of a regression analysis for a dynamics model to a kinematics one
Komatsu, M; Sakaguchi, Y; Miyashita, E
Oral presentation, English, Japan Neuroscience Society
Jul. 2005

Coordinate systems and variables represented by primary motor cortical neurons
Miyashita, E; Sakaguchi; Y. Komatsu
Oral presentation, English, Japan Neuroscience Society
Jul. 2005

知覚的フィリングインが示すさまざまな性質
阪口豊
Public symposium, Japanese, 生理学研究所研究会「視知覚への多角的アプローチー生理、心理物理、計算論」, 生理学研究所, Okazaki
Jun. 2005

RSVP課題における報告属性が結合錯誤に与える影響
藤原 護; 阪口 豊
Oral presentation, Japanese, 日本視覚学会,日本視覚学会冬季大会
Jan. 2005

Not appearance, but disappearance, of a surrounding ring induces immediate perceptual fading
Sakaguchi, Y
Oral presentation, English, 34th Annual Meeting of Society for Neuroscience, San Diego
2004

Temporal activity of primary motor cortical neurons represents the dynamics of arm movements
Miyashita, E; Sakaguchi, Y; Komatsu, M
Oral presentation, English, 34th Annual Meeting of Society for Neuroscience, San Diego
2004

運動指令のwavelet解析に基づく手先軌道の検討
阪口 豊; 和田克己
Oral presentation, Japanese, 第14回日本神経回路学会全国大会講演論文集
2004

最適シナジー数決定のためのデコンポジションアルゴリズムの拡張
石田 文彦; 唐津一行; 阪口 豊
Oral presentation, Japanese, 第14回日本神経回路学会全国大会講演論文集
2004

局所的運動情報の統合に基づく回転変動錯視の知覚モデル
今井 政敬; 阪口 豊
Oral presentation, Japanese, Vision
2004

単一文字の系列呈示における色と方位の結合錯誤
藤原 護; 阪口 豊
Oral presentation, Japanese, Vision
2004

Movement dynamics are encoded by primary motor cortical neurons
Miyashita, E; Sakaguchi, Y
Public symposium, English, Proceedings of 31st NIPS International Symposium, Multidisciplinary Approaches to Sensorimotor Integration, NIPS, Okazaki
2004

主動筋と拮抗筋の同時収縮に関する考察
和田 克己; 阪口 豊
Oral presentation, Japanese, 計測自動制御学会第4回システムインテグレーション部門講演会論文集, 東京
Dec. 2003

終点分散最小軌道は生体ノイズ特性に依存する
井口 尚彦; 阪口 豊
Oral presentation, Japanese, 第13回日本神経回路学会全国大会論文集, 東京
Sep. 2003

プリズム適応における視覚情報の役割
阪口 豊
Oral presentation, Japanese, 第13回日本神経回路学会全国大会論文集, 東京
Sep. 2003

学習曲線の時間変化に着目した自己組織的強化学習アルゴリズム(2)
内田 尚彦; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2003

学習曲線の時間変化に着目した自己組織的強化学習アルゴリズム(2)
内田 尚彦; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告, 電子情報通信学会技術研究報告
Mar. 2003

パルス型細胞モデルに基づくsignal dependent noise発生機構の検討
井口 尚彦; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2003

プリズム適応における誤差情報の役割
阪口 豊
Others, Japanese, 電気通信大学大学院・ISシンポジウム第10回 Sensing and Perception
Mar. 2003

運動制御解析に向けた3次元視線計測
遠藤さやか; 阪口豊
Others, Japanese, 電気通信大学大学院・ISシンポジウム第10回 Sensing and Perception
Mar. 2003

運動制御解析にむけた3次元視線計測システム
遠藤 さやか; 阪口 豊
Oral presentation, Japanese, 計測自動制御学会第3回システムインテグレーション部門講演会論文集(II)
Dec. 2002

眼球運動に着目した情動解析の試み
平山 雄介; 阪口 豊
Oral presentation, Japanese, 計測自動制御学会第3回システムインテグレーション部門講演会論文集(I)
Dec. 2002

学習曲線の時間変化に着目した自己組織的強化学習アルゴリズム
内田 一樹; 阪口 豊
Oral presentation, Japanese, 第12回日本神経回路学会全国大会
Sep. 2002

筋特性に基づく上肢到達運動の運動指令生成モデル
村上 敏之; 阪口 豊
Oral presentation, Japanese, 第12回日本神経回路学会全国大会
Sep. 2002

運動指令伝送路増強に基づく運動安定化モデルに関する考察
井口 尚彦; 阪口 豊
Oral presentation, Japanese, 第12回日本神経回路学会全国大会
Sep. 2002

Contrast dependency of orinetation filling-in
Y. Sakaguchi
Oral presentation, English, Proceedings of 2nd Annual Meeting of Vision Sciences Society
May 2002

運動の安定化に関する一考察
井口 尚彦; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2002

骨格筋モデルに基づく到達運動制御メカニズムの考察
和田 克己; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2002

内部モデルの信頼度に基づく強化学習のアルゴリズム
阪口 豊; 高野 光雄
Oral presentation, Japanese, 第11回日本神経回路学会全国大会
Sep. 2001

環境変化への適応と文脈切替え
阪口 豊; 高野 光雄
Oral presentation, Japanese, 第16回生体・生理工学シンポジウム論文集
Aug. 2001

Perceptual organization guides a shift of visual attention
M. Sekine; Y. Sakaguchi
Oral presentation, English, Perception (ECVP 2001)
Aug. 2001

Contrast dependency of orientation filling-in
Y. Sakaguchi
Oral presentation, English, Proceedings of First Asian Conference on Vision (ACV-2001)
Jul. 2001

盲点領域における動刺激のフィリングイン
藤原 護; 阪口 豊
Oral presentation, Japanese, Vision
Jul. 2001

Inter-target interaction of perceptual filling-in
Y. Sakaguchi
Oral presentation, English, Proceedings of 1st Annual Meeting of Vision Sciences Society (VSS-2001)
May 2001

ダイナミクス整合にもとづく感覚運動統合―ターゲットトラッキングにおける戦略の学習―
尾川順子; 阪口 豊; 並木明夫; 石川正俊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2001

強化学習と教師あり学習を組み合わせたプリズム適応のモデル
阪口 豊; 高野光雄
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2001

老化に伴う運動能力低下に関する研究
田中亮子; 阪口 豊
Others, Japanese, ISシンポジウム第８回「Sensing and Perception」
Mar. 2001

自動採譜システムの構築
杉浦勇樹; 阪口 豊
Others, Japanese, ISシンポジウム第８回「Sensing and Perception」
Mar. 2001

上肢到達運動遂行中のサル運動野神経細胞活動の動力学パラメータによる定量化，
宮下 英三; 阪口 豊
Oral presentation, Japanese, 第24回日本神経科学・第44回日本神経化学合同大会予稿集
2001

Perceptual filling-in at two distinct targets interacts ith each other
Y. Sakaguchi
Oral presentation, English, Investigative Ophthalmology and Visual Science（ARVO-2000）
May 2000

視覚運動変換におけるランプ型適応とステップ型適応の違い
赤司裕一; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2000

注意の動きに着目した図地反転知覚のモデル
安河内 建; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 2000

テクスチャ分離が視覚的注意に及ぼす影響
渡辺正純; 関根道昭; 阪口 豊
Oral presentation, Japanese, Vision
Jan. 2000

うなりを利用した不協和音程の検出
杉浦勇樹; 阪口 豊
Oral presentation, Japanese, 情報処理学会研究報告
2000

目標の位置や性質が知覚的フィリングインに与える影響
阪口 豊
Oral presentation, Japanese, 第23回日本神経科学大会第10回日本神経回路学会大会合同大会抄録集
2000

二つの目標における知覚的フィリングインの相互作用
阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Dec. 1999

Figure-ground asymmetry in perceptual filling-in
Y. Sakaguchi
Oral presentation, English, Investigative Opthalmology and Visual Science
May 1999

Effects of preceptual organization on visual attention
M. Sekine; K. Maeda; Y. Sakaguchi
Oral presentation, English, Investigative Opththalmology and Visual Science
May 1999

知覚的フィリングインにおける図地非対称性
阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 1999

音の立ち上がりのずれが音源分離に与える影響
鈴木 基; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 1999

お手玉の運動制御における視覚情報の役割(2)
山近慎二; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 1999

知覚的フィリングインの二.三の性質
阪口 豊
Oral presentation, Japanese, 日本神経回路学会第9回大会講演論文集
1999

Role of visual information during performing ball-juggling
S. Yamachika; Y. Sakaguchi
Oral presentation, English, Proceedings of 1999 IEEE International Conference on SMC
1999

Relation between visual attention and motor response
Y. Sakaguchi
Oral presentation, English, Investigative Ophthalmology and Visual Science
May 1998

強化学習を用いた能動的認識の自己組織化モデル
高野 光雄; 阪口 豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 1998

お手玉の運動制御における視覚情報の役割
山近慎二; 阪口豊
Oral presentation, Japanese, 電子情報通信学会技術研究報告
Mar. 1998

What determines the endpoint of reaching movement to a risual target?
Y. Sakaguchi
Oral presentation, English, Society for Neuroscience, Abstract
1998

A subliminal effect in a colour-discrimination task and its modulation by spatial attention
Yutaka Sakaguchi; Harold Pashler
Oral presentation, English, Perception
1997

サブリミナル効果とその空間的注意による修飾
阪口 豊
Oral presentation, Japanese, 日本認知科学会第14回大会論文集
1997

色のフィリングインにおける図地の非対称性
阪口 豊
Oral presentation, Japanese, Vision
1997

Visual Information Aquisition during Repetitive Manual Reaching Movements
Yutaka Sakaguchi
Oral presentation, English, Investigative Ophthalmology and Visual Science
May 1996

立ち上がりのずれが音源分離に与える影響
川田 晋; 阪口 豊
Oral presentation, Japanese, 日本音響学会聴覚研究会資料
1996

A study on Poggendorff Illusion in Connection of Depth and Occlusion
Yutaka Sakaguchi; Masanori Idesawa; T. Yamatsuka
Oral presentation, English, Investigative Ophthalmology and Visual Science
May 1995

An attentional model of control of voluntary movement
阪口 豊; 中野 馨
Oral presentation, Japanese, Technical Report of IEICE
Mar. 1994

Motor Planning According to Reliability of Internal Model
阪口 豊; 中野 馨
Oral presentation, Japanese, Technical Report of IEICE
Mar. 1993

A System Simulating Human Haptic Perception
住友謙一; 阪口 豊; 中野 馨
Oral presentation, Japanese, Proceedings of 32nd SICE Annual Conference
1993

Intentional Haptic Sensing System
黒川朋也; 阪口 豊; 中野 馨
Oral presentation, Japanese, Proceedings of 31th SICE Annual Conference
1992

Mathematical Model for Active Perception
阪口 豊; 中野 馨
Oral presentation, Japanese, 第6回生体・生理工学シンポジウム論文集
1991

ライフエンジニアリング特別講義第三
東京工業大学

ライフエンジニアリング特別講義第三
東京工業大学

応用数学A
The University of Electro-Communications

物理学概論第二
The University of Electro-Communications

線形代数学第二
The University of Electro-Communications

線形代数学第二
The University of Electro-Communications

線形代数学第二
電気通信大学

認識の諸相
The University of Electro-Communications

感覚運動システム特論
The University of Electro-Communications

感覚運動システム特論
The University of Electro-Communications

感覚運動システム特論
電気通信大学

物理学概論第二
The University of Electro-Communications

物理学概論第二
電気通信大学

応用数学A
The University of Electro-Communications

応用数学A
電気通信大学

知能機械工学基礎
The University of Electro-Communications

知能機械工学基礎
電気通信大学

感覚情報システム特論
The University of Electro-Communications

感覚情報システム特論
電気通信大学

認識の諸相
The University of Electro-Communications

認識の諸相
電気通信大学

人間情報論２
The University of Electro-Communications

人間情報論２
The University of Electro-Communications

人間情報論２
電気通信大学

日本認知科学会

IEEE

AAAS(American Association for the Advancement of Science)

日本神経科学学会

日本視覚学会

Vision Science Society

American Physiological Society

Society for Neuroscience

日本神経回路学会

電子情報通信学会

ダンスにおける音楽性とは何か～複合的アプローチによる質的要因分析～
水村 真由美
Jul. 2022 - Mar. 2025

楽曲演奏におけるリズム構造の構築とその実現
西井 淳
Jul. 2022 - Mar. 2025

The study on the neural dynamics for understanding communication in terms of complex hetero systems
TSUDA Ichiro; NISHIURA Yasumasa; OMORI Takashi; MIZUHARA Hiroaki; AIHARA Takeshi; INUI Toshio; KANEKO Kunihiko; YAMAGUCHI Yoko; OKUDA Jiro; NAKAMURA Katsuki; HASHIMOTO Takashi; SAKAGUCHI Yutaka
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Hokkaido University, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), 領域の事後評価はAであり、その成果を冊子体の形で集約し、広く社会・国民に情報提供することには大きな意義がある。取りまとめ研究成果は以下のとおりである。 １．成果報告書の冊子体での編集と製本を行った。計画班11、公募班44の全ての計画研究・公募研究の班員が、計画班各８ページ、公募班各４ページで執筆し、研究の狙いとその成果を文書と図でわかりやすくまとめた。これらを冊子として製本し、領域に参加する研究者と関係者に配布した。 ２．成果報告書のＣＤを作成し、冊子体に添付する形で配布した。 ３．本成果をWeb上のデータベースDynamic Brain Platformとして成果公開するための準備を完成させた。これまで当領域の成果報告の場として作成公開して来たホームページは、領域終了後に管理できなくなる。そこで、この領域ホームページをINCF 日本ノードDynamic Bain Platform (DB-PF)に移管した。また、成果報告書の電子版をDB-PFにアップロードするための準備を行った。本公開は、広範な分野の人々から永続的な閲覧を可能にするもので、成果を社会・国民に発信する方法として有効であると期待できる。, 21120001
23 Jul. 2009 - 31 Mar. 2014

視覚誘導性到達運動のメカニズムに関する研究
阪口 豊; 関根 道昭
日本学術振興会, 科学研究費助成事業, 電気通信大学, 特定領域研究(A), 視覚的に与えられた目標に対して到達運動を行なう際の脳内過程を解明するため,心理実験と計算理論の手法を用いて研究を行なった.今年度は,二重課題の手法を用いた心理実験により運動指令生成の脳内過程の一端をつかむ結果を得たほか,そのメカニズムを説明する計算モデルを考案した. 実験において,被験者は,目標が提示されるとすぐに目標に対して手先を動かすとともに,音が提示されるとすぐに音の高低をマウスのボタンを使って答える.目標提示から音提示までの時間間隔を50-1250msの範囲でランダムに定め,音課題の反応時間が到達運動の進行とともにどのように変化するかを分析した. その結果,音刺激の反応時間は,目標提示直後に増加しいったん急激に減少したのち,運動開始から運動終了に向けてゆっくりと減少することがわかった.このほか,運動終了200msごろに反応時間の最小値が急減する現象も見られた.また,対照実験の結果から,これらの現象は到達運動の実行に特有であることが明らかになった. 音課題の反応時間が到達運動のフェーズに応じてさまざまな影響を受けたという事実は,到達運動の実行において,複数のプロセスが運動の進行とともに役割を交代しながら関与していることを強く示唆する. 一方,運動指令生成の計算モデルに関しては,運動指令計画系と制御系が一体となったモデルを考えることで,昨年度の研究で明らかになった眼球運動の影響と上述した二重課題干渉を説明できるものを構成した.このモデルは,筋骨格系の順ダイナミクスモデルを用いて到達点を予測しながら適切な運動指令を選択するもので,その計算を運動実行中にオンラインで行なうことで運動開始後の環境変化に追随できる. このモデルは全体の骨格を定めた段階であり,今後アルゴリズムを具体化して数値実験を行なうことにより,その振舞いを検証し,モデルの有効性を示す必要がある., 11145215
1999 - 1999

注意に依存した知覚体制化のメカニズムに関する工学的研究
阪口 豊
日本学術振興会, 科学研究費助成事業, 電気通信大学, 奨励研究(A), 1.従来から知られている錯視図形や多義図形に関して文献調査を行ない,知覚体制化に関する実験事実について検討した. 2.本年度の予算により導入した視覚刺激生成装置,画像表示装置を用いて,種々の視覚パターンを生成,提示し,被験者がどのような知覚を得るかについて心理物理学的手法を用いて実験を行なった.また,運動する点群や3次元的構造をもつ点群を提示して,それらが群化される様相について実験を行なった. 3.2.で得られたデータを検討した結果,1)知覚表現の単純化と2)知覚体制化のスコープの二つが,知覚体制化の原理メカニズムとして重要であるという示唆が得られた.1)は,「脳は対象の脳内表現がなるべく単純になるような知覚を得る」という仮説であり,2)は,「知覚体制化が起こる領域(スコープ)は動的に変化し,これが多義図形や不可能図形の解釈において本質的な役割を果たす」という仮説である.この仮説の下で,「注意」は体制化のスコープを制御する機能を担うものという解釈が得られた. 4.情報理論におけるAICやMDLの考え方を参照して,3.1)で挙げた「表現単純化原理」をアルゴリズムの形で定式化することを試みたが,完成には至らなかった. 5.今後の課題や発展として,1)異なる実験的手法を用いて,4.で述べたアルゴリズムを構築するために必要な実験データをさらに収集すること,2)それに基づいて上記のアルゴリズムを確実に動作する形に改善すること,3)さらに,脳の情報表現様式に関わる具体的なモデルを構成し3.で述べた仮説を検証することが挙げられる., 07780311
1995 - 1995

一般組織化に関する工学的研究
中野 馨; 阪口 豊
日本学術振興会, 科学研究費助成事業, 東京大学, 一般研究(C), 自然界の情報処理メカニズムの中で、脳の知的情報処理と、構造の自己組織化は特に興味深い。後者は化合などに始まり、生体の組織化にも及び、増殖と進化の所産として前者を生み出したといえる。このメカニズムの解明は生命工学研究の一環として重要であるばかりでなく、現実に役立つ新しい情報処理方式の開発につながると考えられる。 ここでは、脳の情報処理に関する我々自身の研究成果を活用して、構造の自己組織化の一つのモデルを構築した。抽象的になり易いテーマなので、具体的なイメージを打ち出すため、ハードウェアの場を考えた。まず、モータ、車輪、バッテリ、光センサ、タッチセンサなどを内蔵する5種類多数の素子で構造体を作ったとき、構造に応じて多様な機能が現れるようにしておく。そして、自然に発生した(またはランダムに初期設定された)構造情報が交配と突然変異によって次々に変化していくとき、種々の構造体が発生するようなモデルを構成した。構造情報(システム記述と名付ける)とその発現機構は、なかなかロバスト(頑健)にならない。つまり、交配を繰り返すうちに、構造体を表現できなくなってしまう。これを、有用な中間構造体を表現する第1段のシステム記述、最終の構造体を表現する第2段のシステム記述にわける階層メカニズムによって回避した。この結果を国際学会 IEEE World Congress on Evolutionary Computationに発表した。その後改良を重ね、機能的な構造体を効率的に自己発生するモデルとすることができた。発生した構造体(ロボット)は、例えば、障害物をよける、光の下で回転し暗闇で止まる、走光性、背光性などの機能を持つ。構造体発生のロバスト性を求めた結果、必然的に生体の増殖メカニズムへの類似性が現れた点が、この種の情報処理の本質を示しており、重要である。, 06808033
1994 - 1994

能動的認識アルゴリズムに基づく音源分離の研究
阪口 豊
日本学術振興会, 科学研究費助成事業, 電気通信大学, 奨励研究(A), 1.昨年度までに提案した能動的認識のアルゴリズムを時間的な予測を含む場合に拡張し,少ない観測回数で対象の時間的変化を効率よく推定するアルゴリズムを構成した.また,構成したアルゴリズムの有効性を数値実験により検証した. 2.本年度の予算により導入した音声記録装置を用いて,種々の楽器音のデータを収集した.また,計算機によって人工的に音声データを生成し,音源分離実験のための音声データベースを作成した. 3.2.で得られたデータを解析した結果,音源分離のためのカギとなる特徴として,音の変化の同期性や倍音構造が有用であることが確認された.その一方で,これまでに提案してきた能動的認識のアルゴリズムに加えて,知覚体制化のアルゴリズムを構成し,それらの相互作用により特定の音源の情報を分離するメカニズムを考える必要があることが明らかになった. 4.3.の問題を解決するため,視覚の分野で得られている知覚体制化の原理を聴覚の分野に適用し,それを工学的なアルゴリズムとして定式化することを試みたが,完成には至らなかった. 5.4.と並行して,聴覚における知覚体制化のメカニズムを調べるため,特に,知覚体制化と関係があると思われる錯覚減少に着目して,合成音を用いた心理学的実験を行なった., 06780300
1994 - 1994

眼球位置計測装置
Patent right, 阪口豊, 石田文彦, 島井博行, 溝尾元洋, 2006-50880, Date applied: 27 Feb. 2006, The University of Electro-Communications

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