2019年, 北海道大学, 平成30年度全学教育科目エクセレントティーチャーズ（フレッシュマンズセミナー「北大脳科学への招待」、講義分担者）　　　　　　　　　　　　　　　

2017年, 北海道大学, 平成28年度全学教育科目エクセレントティーチャーズ（体育学Ｂ，講義責任者）　　　　　　　　　　　　　　　
阿部匡樹

2013年, 第３回生理学研究所社会神経科学研究会, トラベルアワード　　　　　　　　　　　　　　　
阿部匡樹

2012年, 第６回Motor Control研究会, 優秀発表賞　　　　　　　　　　　　　　　
阿部匡樹

2011年, 第１回生理学研究所社会神経科学研究会, トラベルアワード　　　　　　　　　　　　　　　
阿部匡樹

2011年, 第５回Motor Control研究会, 優秀発表賞　　　　　　　　　　　　　　　
阿部匡樹

2009年, An international workshop on Computational principles of sensory motor learning, Travel bursary award　　　　　　　　　　　　　　　
阿部匡樹

2008年, 19th conference of Society for the Neural Control of Movement, Travel scholarship award　　　　　　　　　　　　　　　
阿部匡樹

Implicit sensorimotor learning in ballistic movement for transporting an object to a target
Naoyoshi Matsuda, Masaki O. Abe
Scientific Reports, 14, 1, 21003, Springer Science and Business Media LLC, 2024年09月09日, ［査読有り］
英語, 研究論文（学術雑誌）

Attenuation of implicit motor learning with consecutive exposure to visual errors
Naoyoshi Matsuda, Masaki O. Abe
IBRO Neuroscience Reports, 17, 32, 37, Elsevier BV, 2024年05月, ［査読有り］, ［責任著者］
英語, 研究論文（学術雑誌）

Implicit motor adaptation driven by intermittent and invariant errors
Matsuda N, Abe MO
Experimental Brain Research, 241, 2125, 2132, 2023年07月, ［査読有り］, ［責任著者］
英語, 研究論文（学術雑誌）, 12508523

Error Size Shape Relationships between Motor Variability and Implicit Motor Adaptation
Matsuda N, Abe MO
Biology, 12, 404, 1, 13, 2023年03月, ［査読有り］, ［責任著者］
英語, 研究論文（学術雑誌）, 12508523

Imitation inhibition and facial expression recognition: imitation-inhibition training inhibits the impact of interference with facial mimicry　　　　　　　　　　　　　　　
Matsuda N, Abe MO
Cognitive Studies, 29, 4, in press, 2022年12月, ［査読有り］, ［責任著者］
英語, 研究論文（学術雑誌）

Differences in the effect of transcranial direct current stimulation of the pre-supplementary motor area on imitation inhibition according to autism spectrum traits
Matsuda N, Abe MO
PsyArXiv, 1, 20, 2022年02月, ［責任著者］
英語, 研究論文（学術雑誌）

Neural correlates of online cooperation during joint force production
Abe MO, Koike T, Okazaki S, Sugawara KS, Takahashi K, Watanabe K, Sadato N
NeuroImage, 191, 150, 161, 2019年02月, ［査読有り］, ［筆頭著者］, ［国際誌］
英語, 研究論文（学術雑誌）, During joint action, two or more persons depend on each other to accomplish a goal. This mutual recursion, or circular dependency, is one of the characteristics of cooperation. To evaluate the neural substrates of cooperation, we conducted a hyperscanning functional MRI study in which 19 dyads performed a joint force-production task. The goal of the task was to match their average grip forces to the target value (20% of their maximum grip forces) through visual feedback over a 30-s period; the task required taking into account other-produced force to regulate the self-generated one in real time, which represented cooperation. Time-series data of the dyad's exerted grip forces were recorded, and the noise contribution ratio (NCR), a measure of influence from the partner, was computed using a multivariate autoregressive model to identify the degree to which each participant's grip force was explained by that of their partner's, i.e., the degree of cooperation. Compared with the single force-production task, the joint task enhanced the NCR and activated the mentalizing system, including the medial prefrontal cortex, precuneus, and bilateral posterior subdivision of the temporoparietal junction (TPJ). In addition, specific activation of the anterior subdivision of the right TPJ significantly and positively correlated with the NCR across participants during the joint task. The effective connectivity of the anterior to posterior TPJ was upregulated when participants coordinated their grip forces. Finally, the joint task enhanced cross-brain functional connectivity of the right anterior TPJ, indicating shared attention toward the temporal patterns of the motor output of the partner. Since the posterior TPJ is part of the mentalizing system for tracking the intention of perceived agents, our findings indicate that cooperation, i.e., the degree of adjustment of individual motor output depending on that of the partner, is mediated by the interconnected subdivisions of the right TPJ.

Coherence between oscillations in the cardiorespiratory system and tissue oxygen index in muscle recovering from intensive exercise in humans　　　　　　　　　　　　　　　
Usuda N, Shirakawa K, Hatano K, Abe MO, Yunoki T, Yano T
Physiology International, 106, 3, 261, 271, 2019年, ［査読有り］
英語, 研究論文（学術雑誌）

Ankle muscle co-contractions during quiet standing are associated with decreased postural steadiness in the elderly
Albert H. Vette, Dimitry G. Sayenko, Michael Jones, Masaki O. Abe, Kimitaka Nakazawa, Kei Masani
GAIT & POSTURE, 55, 31, 36, ELSEVIER IRELAND LTD, 2017年06月, ［査読有り］
英語, 研究論文（学術雑誌）, It has been reported that the elderly use co-contraction of the tibialis anterior (TA) and plantarfiexor muscles for longer duration during quiet standing than the young. However, the particular role of ankle muscle co contractions in the elderly during quiet standing remains unclear. Therefore, the objective of this study was to investigate the association between ankle muscle co -contractions and postural steadiness during standing in the elderly. Twenty-seven young (27.2 +/- 4.5 yrs) and twenty-three elderly (66.2 +/- 5.0 yrs) subjects were asked to stand quietly on a force plate for five trials. The center of pressure (COP) trajectory and its velocity (COPv) as well as the center of mass (COM) trajectory and its velocity (COMv) and acceleration (ACC) were calculated using the force plate outputs. Electromyograms were obtained from the right TA, soleus (SOL), and medial gastrocnemius (MG) muscles. Periods of TA activity (TAon) and inactivity (TAoff) were determined using an EMG threshold based on TA resting level. Our results indicate that, in the elderly, the COPv, COMv, and ACC variability were significantly larger during TAon periods compared to TAoff periods. However, in the young, no significant association between respective variability and TA activity was found. We conclude that ankle muscle co-contractions in the elderly are not associated with an increase, but a decrease in postural steadiness. Future studies are needed to clarify the causal relationship between (1) ankle muscle co-contractions and (2) joint stiffness and multi-segmental actions during standing as well as their changes with aging.

Neuromotor Noise Is Malleable by Amplifying Perceived Errors
Christopher J. Hasson, Zhaoran Zhang, Masaki O. Abe, Dagmar Sternad
PLOS COMPUTATIONAL BIOLOGY, 12, 8, e1005044, PUBLIC LIBRARY SCIENCE, 2016年08月, ［査読有り］
英語, 研究論文（学術雑誌）, Variability in motor performance results from the interplay of error correction and neuromotor noise. This study examined whether visual amplification of error, previously shown to improve performance, affects not only error correction, but also neuromotor noise, typically regarded as inaccessible to intervention. Seven groups of healthy individuals, with six participants in each group, practiced a virtual throwing task for three days until reaching a performance plateau. Over three more days of practice, six of the groups received different magnitudes of visual error amplification; three of these groups also had noise added. An additional control group was not subjected to any manipulations for all six practice days. The results showed that the control group did not improve further after the first three practice days, but the error amplification groups continued to decrease their error under the manipulations. Analysis of the temporal structure of participants' corrective actions based on stochastic learning models revealed that these performance gains were attained by reducing neuromotor noise and, to a considerably lesser degree, by increasing the size of corrective actions. Based on these results, error amplification presents a promising intervention to improve motor function by decreasing neuromotor noise after performance has reached an asymptote. These results are relevant for patients with neurological disorders and the elderly. More fundamentally, these results suggest that neuromotor noise may be accessible to practice interventions.

共同運動のパフォーマンスを最適化する方略（特集 未来の扉をひらく運動の研究）　　　　　　　　　　　　　　　
阿部匡樹
体育の科学, 66, 19, 23, 2016年, ［招待有り］
日本語

Heel strike detection using split force-plate treadmill
Hossein Rouhani, Masaki O. Abe, Kimitaka Nakazawa, Milos R. Popovic, Kei Masani
GAIT & POSTURE, 41, 3, 863, 866, ELSEVIER IRELAND LTD, 2015年03月, ［査読有り］
英語, 研究論文（学術雑誌）, A common source of error when detecting heel-strike moments utilizing split force-plate treadmills is unwillingly stepping on contra-lateral force-plate. In this study, we quantified this error when heel-strike was detected based on such erroneous data and compared three methods to investigate how well the heel-strikes and stride-intervals were detected with erroneous data. Eleven subjects walked on a split force-plate treadmill for more than 20 min. We used 20 N and 50% body-weight thresholds to detect the heel-strike moments (HS20N and HS50%, respectively). Besides, we used linear approximation to estimate the unaffected force profile from affected force-plate data, and subsequently to detect the heel-strike moments (HSest). We used heel-strike moments detected by a foot-switch as a reference to compare accuracy of HS20N, HS50% and HSest. HS20N and HSest detected heel-strike moments accurately for unaffected force-plate data (median(max) errors for all subjects: 9(23) and 9(37) ms) but HS50% showed significantly larger errors (52(74) ms). Unlike HS50% and HSest, HS20N was considerably affected by the affected force-plate data (23(68) ms). The error in stride-interval measurement was relatively small using any methods for unaffected force-plate data (3(7), 6(8), and 6(12) ms), while stride-interval errors were large for some subjects when using HS20N for affected data (6(175) ms).
We concluded that unwillingly stepping on contra-lateral force-plate occurred a few percent and up to 37.7% of all strides (median: 12.9%). Our proposed method (HSest) robustly showed small errors for heel-strike detection and stride-interval calculation consistently among subjects, while HS50% and HS20N showed large errors depending on subjects. (C) 2015 Elsevier B.V. All rights reserved.

Joint actionに潜む集合知 : 共同力発揮課題における力分配決定の機序 (クラウドネットワークロボット)
阿部 匡樹, 渡邊 克巳
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 114, 351, 19, 22, 一般社団法人電子情報通信学会, 2014年12月04日
日本語, 2人以上の人間が1つのゴールを目指して協働するjoint actionにおいて,ゴールを達成するための協働パターンは無限に存在する.本研究では単純かつ斬新な実験設定を用いて.この冗長な状況下における個人間の組織化の潜在的なメカニズムを調べた.その結果,共同力発揮課題の組織化には,グループのパフォーマンスを最大限に高めようとする最適化と,ときにそれとは相反する社会的相互作用が含まれていた.さらに,2人課題では主にパフォーマンスの最適化に基づく組織化が行われる一方で,3人課題では社会的相互作用が組織化に強く影響を及ぼすことが示唆された.

Error amplification improves performance by reducing motor noise
Christopher J. Hasson, Zhaoran Zhang, Masaki Abe, Dagmar Sternad
Proceedings of the IEEE Annual Northeast Bioengineering Conference, NEBEC, 2014-, Institute of Electrical and Electronics Engineers Inc., 2014年12月02日, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, Information about error via visual feedback presents important information to promote motor learning. Amplifying error information has shown to be beneficial but the mechanism(s) behind such benefits have not been elucidated. We used a virtual throwing task and model-based system identification to test the hypothesis that performance improvement could not only be attained by an increase in feedback gain, but also by a decrease in intrinsic motor noise. The experiment manipulated the visual error by amplification at three gain levels. Some groups received error amplification with added noise. The experimental results showed that error amplification improved task performance, consistent with previous studies. The system identification results, based on a previously validated learning model, showed that this improvement was brought about primarily by a reduction in the overall amount of intrinsic motor noise, supporting our hypothesis. However, contrary to our expectations, adding noise to the error amplification did not enhance this effect.

Center of pressure velocity reflects body acceleration rather than body velocity during quiet standing
Kei Masani, Albert H. Vette, Masaki O. Abe, Kimitaka Nakazawa
GAIT & POSTURE, 39, 3, 946, 952, ELSEVIER IRELAND LTD, 2014年03月, ［査読有り］
英語, 研究論文（学術雑誌）, The purpose of this study was to test the hypothesis that the center of pressure (COP) velocity reflects the center of mass (COM) acceleration due to a large derivative gain in the neural control system during quiet standing. Twenty-seven young (27.2 +/- 4.5 years) and twenty-three elderly (66.2 +/- 5.0 years) subjects participated in this study. Each subject was requested to stand quietly on a force plate for five trials, each 90 s long. The COP and COM displacements, the COP and COM velocities, and the COM acceleration were acquired via a force plate and a laser displacement sensor. The amount of fluctuation of each variable was quantified using the root mean square. Following the experimental study, a simulation study was executed to investigate the experimental findings. The experimental results revealed that the COP velocity was correlated with the COM velocity, but more highly correlated with the COM acceleration. The equation of motion of the inverted pendulum model, however, accounts only for the correlation between the COP and COM velocities. These experimental results can be meaningfully explained by the simulation study, which indicated that the neural motor command presumably contains a significant portion that is proportional to body velocity. In conclusion, the COP velocity fluctuation reflects the COM acceleration fluctuation rather than the COM velocity fluctuation, implying that the neural motor command controlling quiet standing posture contains a significant portion that is proportional to body velocity. (C) 2013 Elsevier B. V. All rights reserved.

Error Amplification Improves Performance by Reducing Motor Noise
Christopher J. Hasson, Zhaoran Zhang, Masaki Abe, Dagmar Sternad
2014 40TH ANNUAL NORTHEAST BIOENGINEERING CONFERENCE (NEBEC), IEEE, 2014年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）, Information about error via visual feedback presents important information to promote motor learning. Amplifying error information has shown to be beneficial but the mechanism(s) behind such benefits have not been elucidated. We used a virtual throwing task and model-based system identification to test the hypothesis that performance improvement could not only be attained by an increase in feedback gain, but also by a decrease in intrinsic motor noise. The experiment manipulated the visual error by amplification at three gain levels. Some groups received error amplification with added noise. The experimental results showed that error amplification improved task performance, consistent with previous studies. The system identification results, based on a previously validated learning model, showed that this improvement was brought about primarily by a reduction in the overall amount of intrinsic motor noise, supporting our hypothesis. However, contrary to our expectations, adding noise to the error amplification did not enhance this effect.

冗長解に対する運動制御系の方略を探る
阿部 匡樹
バイオメカニズム, 22, 0, 59, 68, バイオメカニズム学会, 2014年, ［査読有り］
日本語, <p>一つの標的に対する到達運動の解が無限にあるように, 目標志向性課題における運動制御は様々な階層において冗長性を有する. 近年, 我々の運動制御系はパフォーマンスのばらつきを最小限度に抑えるためにむしろこの冗長性を利用していることが示唆されてきたが, この評価は多分にその解析法に依存する. 本研究では運動課題遂行変数の幾何学的・時系列的パターン抽出を題材とし, 冗長性に対するヒトの運動制御の特徴ならびにその評価法を議論する.</p>

Modulation between bilateral legs and within unilateral muscle synergists of postural muscle activity changes with development and aging
Hiroki Obata, Masaki O. Abe, Kei Masani, Kimitaka Nakazawa
EXPERIMENTAL BRAIN RESEARCH, 232, 1, 1, 11, SPRINGER, 2014年01月, ［査読有り］
英語, 研究論文（学術雑誌）, The effect of development and aging on common modulation between bilateral plantarflexors (i.e., the right and left soleus, and the right and left medial gastrocnemius) (bilateral comodulation) and within plantarflexors in one leg (i.e., the right soleus and the right medial gastrocnemius) (unilateral comodulation) was investigated during bipedal quiet standing by comparing electromyography-electromyography (EMG) coherence among three age groups: adult (23-35 years), child (6-8 years), and elderly (60-80 years). The results demonstrate that there was significant coherence between bilateral plantarflexors and within plantarflexors in one leg in the 0- to 4-Hz frequency region in all three age groups. Coherence in this frequency region was stronger in the elderly group than in the adult group, while no difference was found between the adult and child groups. Of particular interest was the finding of significant coherence in bilateral and unilateral EMG recordings in the 8- to 12-Hz frequency region in some subjects in the elderly group, whereas it was not observed in the adult and child groups. These results suggest that aging affects the organization of bilateral and unilateral postural muscle activities (i.e., bilateral and unilateral comodulation) in the plantarflexors during quiet standing.

両手力制御における短期干渉と長期協調 : 相反する2つの側面は異なる周波数領域において共存する (ニューロコンピューティング)
阿部 匡樹, 渡邊 克巳
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 113, 111, 89, 93, 一般社団法人電子情報通信学会, 2013年06月27日
日本語, 左右の手を用いて1つの動作を行う両手共同制御は,2つの相反する特性を有する.1つは一方の手がもう一方の手の制御に影響を及ぼす干渉的な側面,もう1つはお互いのエラーを補完しあう協調的な側面である.ゴール志向性の力制御では一過性力発揮課題において前者が,等尺性力発揮課題において後者が報告されているが,本研究では等尺性共同力発揮課題において2つの側面が共存することを心理物理実験の結果を通して報告する.

Directionality in distribution and temporal structure of variability in skill acquisition
Masaki O. Abe, Dagmar Sternad
FRONTIERS IN HUMAN NEUROSCIENCE, 7, MAY, 225, FRONTIERS RESEARCH FOUNDATION, 2013年06月, ［査読有り］
英語, 研究論文（学術雑誌）, Observable structure of variability presents a window into the underlying processes of skill acquisition, especially when the task affords a manifold of solutions to the desired task result. This study examined skill acquisition by analyzing variability in both its distributional and temporal structure. Using a virtual throwing task, data distributions were analyzed by the Tolerance, Noise, Covariation-method (TNC); the temporal structure was quantified by autocorrelation and detrended fluctuation analysis (DFA). We tested four hypotheses: (1) Tolerance and Covariation, not Noise, are major factors underlying long-term performance improvement. (2) Trial-to-trial dynamics in execution space exhibits preferred directions. (3) The direction-dependent organization of variability becomes more pronounced with practice. (4) The anisotropy is in directions orthogonal and parallel to the solution manifold. Results from 13 subjects practicing for 6 days revealed that performance improvement correlated with increasing Tolerance and Covariation; Noise remained relatively constant. Temporal fluctuations and their directional modulation were identified by a novel rotation method that was a priori ignorant about orthogonality. Results showed a modulation of time-dependent characteristics that became enhanced with practice. However, this directionality was not coincident with orthogonal and parallel directions of the solution manifold. A state-space model with two sources of noise replicated not only the observed temporal structure but also its deviations from orthogonality. Simulations suggested that practice-induced changes were associated with an increase in the feedback gain and a subtle weighting of the two noise sources. The directionality in the structure of variability depended on the scaling of the coordinates, a result that highlights that analysis of variability sensitively depends on the chosen coordinates.

Abnormal capacity for grip force control in patients with congenital insensitivity to pain
Noritaka Kawashima, Masaki O. Abe, Tsutomu Iwaya, Nobuhiko Haga
EXPERIMENTAL BRAIN RESEARCH, 218, 4, 579, 588, SPRINGER, 2012年05月, ［査読有り］
英語, 研究論文（学術雑誌）, Congenital insensitivity to pain (CIP), which is an extremely rare sensory neuropathy, is defined as the absence of normal responses to noxious stimuli. Although motor function is not directly impaired in CIP patients, it is likely that the sensory deficit affects the motor control system. In order to characterize motor capacity in CIP patients, we here measured grip force and acceleration of a held object in 12 patients with CIP and 12 age-matched able-bodied subjects. The results demonstrated that the grip force during the object grasp-lift-holding task was significantly greater, less reproducibility and greater fluctuation in the acceleration of the object in CIP patients than in normal subjects. Moreover, some patients showed absence of temporal coupling between the grip and load force, suggesting that anticipatory modulation of the grip force was at least partly impaired. As far as the authors know, this is the first study to characterize motor control ability in patients with CIP. The observed abnormal motor capacity can be at least partly attributed to a lack of sensory inputs mediated by A delta and unmyelinated C-, specifically C-tactile, fibers. The present results may provide information useful for the prevention of secondary injury and education for patients during the developmental stage.

Neuromotor Noise, Error Tolerance and Velocity-Dependent Costs in Skilled Performance
Dagmar Sternad, Masaki O. Abe, Xiaogang Hu, Hermann Mueller
PLOS COMPUTATIONAL BIOLOGY, 7, 9, e1002159, PUBLIC LIBRARY SCIENCE, 2011年09月, ［査読有り］
英語, 研究論文（学術雑誌）, In motor tasks with redundancy neuromotor noise can lead to variations in execution while achieving relative invariance in the result. The present study examined whether humans find solutions that are tolerant to intrinsic noise. Using a throwing task in a virtual set-up where an infinite set of angle and velocity combinations at ball release yield throwing accuracy, our computational approach permitted quantitative predictions about solution strategies that are tolerant to noise. Based on a mathematical model of the task expected results were computed and provided predictions about error-tolerant strategies (Hypothesis 1). As strategies can take on a large range of velocities, a second hypothesis was that subjects select strategies that minimize velocity at release to avoid costs associated with signal-or velocity-dependent noise or higher energy demands (Hypothesis 2). Two experiments with different target constellations tested these two hypotheses. Results of Experiment 1 showed that subjects chose solutions with high error-tolerance, although these solutions also had relatively low velocity. These two benefits seemed to outweigh that for many subjects these solutions were close to a high-penalty area, i.e. they were risky. Experiment 2 dissociated the two hypotheses. Results showed that individuals were consistent with Hypothesis 1 although their solutions were distributed over a range of velocities. Additional analyses revealed that a velocity-dependent increase in variability was absent, probably due to the presence of a solution manifold that channeled variability in a task-specific manner. Hence, the general acceptance of signal-dependent noise may need some qualification. These findings have significance for the fundamental understanding of how the central nervous system deals with its inherent neuromotor noise.

Smaller sway size during quiet standing is associated with longer preceding time of motor command to body sway
Kei Masani, Albert H. Vette, Masaki O. Abe, Kimitaka Nakazawa, Milos R. Popovic
GAIT & POSTURE, 33, 1, 14, 17, ELSEVIER IRELAND LTD, 2011年01月, ［査読有り］
英語, 研究論文（学術雑誌）, In previous studies, it was found using cross-correlation analysis that the modulation of the motor command to the calf muscles largely precedes body sway during quiet standing. The purpose of this study was to investigate whether this preceding time is correlated with an improved stabilization of the body. 26 young and 23 elderly healthy subjects were asked to stand quietly. Body sway was measured using a laser displacement sensor, and the electromyogram of the right soleus was measured as a representative of the motor command. The correlation and the time shift between motor command and body sway were estimated by means of cross-correlation analysis. We found that sway size was correlated with the identified time shift: that is, a smaller sway size was associated with a longer preceding time. The obtained results suggest that a control strategy generating a larger preceding time can stabilize the body more effectively. This result was found in both the young and elderly, suggesting that the particular control aspect associated with the time shift is a common feature in both age groups. (C) 2010 Elsevier B.V. All rights reserved.

パフォーマンスのばらつきを如何に減らすか--運動課題の冗長性を利用したストラテジー (特集 知覚・認知からみた身体運動の制御と学習--トレーニングへの示唆)
阿部 匡樹
トレーニング科学, 23, 2, 105, 111, 日本トレーニング科学会, 2011年, ［招待有り］
日本語

Temporal correlations in center of body mass fluctuations during standing and walking
Masaki O. Abe, Kei Masani, Daichi Nozaki, Masami Akai, Kimitaka Nakazawa
HUMAN MOVEMENT SCIENCE, 29, 4, 556, 566, ELSEVIER SCIENCE BV, 2010年08月, ［査読有り］
英語, 研究論文（学術雑誌）, Body fluctuations during both quiet standing and walking exhibit temporal correlations that reflect mechanisms of balance control. However, knowledge about the relationship between the temporal structures observed during standing and walking is limited. The goal of the present study was (1) to investigate temporal correlations in the fluctuations of the center of body mass acceleration (ACC) in standing and walking, and (2) to test the hypothesis that the degree of the temporal correlation for the two tasks is similar and correlated across participants. Seventeen young, healthy participants stood and walked for 10 min on a treadmill equipped with two force platforms. The temporal correlations of the ACC in the anteroposrerior (ACC(AP)), mediolateral (ACC(ML)), and two-dimensional (ACC(2D)) directions were evaluated using the scaling index (alpha) as calculated with Detrended Fluctuation Analysis. The scaling indices of ACC fluctuations during standing and walking were categorized as stationary signals which are temporally correlated (0.5 < alpha < 1.0). Further, there were significant, positive correlations for ACC(AP) and ACC(2D) between the scaling indices during standing and walking. The results suggest that there are common characteristics in the balance control system for standing and walking, which may be associated with temporal correlations in COM acceleration. (C) 2010 Elsevier B.V. All rights reserved.

Evaluation of postural control in quiet standing using center of mass acceleration: Comparison among the young, the elderly, and people with stroke
Erkang Yu, Masaki Abe, Kei Masani, Noritaka Kawashima, Fumio Eto, Nobuhiko Haga, Kimitaka Nakazawa
ARCHIVES OF PHYSICAL MEDICINE AND REHABILITATION, 89, 6, 1133, 1139, W B SAUNDERS CO-ELSEVIER INC, 2008年06月, ［査読有り］
英語, 研究論文（学術雑誌）, Objective: To determine center of mass (COM) acceleration usefulness in the evaluation of postural control during quiet standing.
Design: Three-group comparison design.
Setting: A research laboratory.
Participants: Poststroke subjects (n=12), healthy elderly subjects (n=22), and healthy young subjects (n=25).
Interventions: Not applicable.
Main Outcome Measures: With a force platform, postural sway was evaluated by using the standard deviations of COM acceleration and center of pressure (COP) and COM (COP-COM) in which COP-COM represents the distance between the COP and the COM.
Results: COM acceleration and COP-COM variables were greater in the poststroke group than in the healthy groups (elderly and young) in the mediolateral (ML) direction. Both variables in the anteroposterior (AP) direction were greater in the poststroke group and the elderly group than in the young group. Furthermore, the correlations between COM acceleration and COP-COM in each group in each direction were shown to be significantly high (r range,.906-.979; P<.001).
Conclusions: COM acceleration was useful in the evaluation of postural control during quiet standing when comparing the young, the elderly, and poststroke patients. Additionally, COM acceleration and COP-COM in both the AP and ML directions during quiet standing were significantly and highly correlated. Thus, we proposed that COM acceleration can be an alternative and convenient measure instead of COP-COM in the evaluation of postural control.

Shaping appropriate locomotive motor output through interlimb neural pathway within spinal cord in humans
Noritaka Kawashima, Daichi Nozaki, Masaki O. Abe, Kimitaka Nakazawa
JOURNAL OF NEUROPHYSIOLOGY, 99, 6, 2946, 2955, AMER PHYSIOLOGICAL SOC, 2008年06月, ［査読有り］
英語, 研究論文（学術雑誌）, Direct evidence supporting the contribution of upper limb motion on the generation of locomotive motor output in humans is still limited. Here, we aimed to examine the effect of upper limb motion on locomotor-like muscle activities in the lower limb in persons with spinal cord injury (SCI). By imposing passive locomotion-like leg movements, all cervical incomplete (n = 7) and thoracic complete SCI subjects (n = 5) exhibited locomotor-like muscle activity in their paralyzed soleus muscles. Upper limb movements in thoracic complete SCI subjects did not affect the electromyographic (EMG) pattern of the muscle activities. This is quite natural since neural connections in the spinal cord between regions controlling upper and lower limbs were completely lost in these subjects. On the other hand, in cervical incomplete SCI subjects, in whom such neural connections were at least partially preserved, the locomotor-like muscle activity was significantly affected by passively imposed upper limb movements. Specifically, the upper limb movements generally increased the soleus EMG activity during the backward swing phase, which corresponds to the stance phase in normal gait. Although some subjects showed a reduction of the EMG magnitude when arm motion was imposed, this was still consistent with locomotor-like motor output because the reduction of the EMG occurred during the forward swing phase corresponding to the swing phase. The present results indicate that the neural signal induced by the upper limb movements contributes not merely to enhance but also to shape the lower limb locomotive motor output, possibly through interlimb neural pathways. Such neural interaction between upper and lower limb motions could be an underlying neural mechanism of human bipedal locomotion.

歩行時および静止立位時における身体重心加速度動揺特性 : 加齢による影響
阿部 匡樹, 中澤 公孝, 政二 慶, 赤居 正美
日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research, 27, 347, 352, 2006年10月20日
日本語

Alternate leg movement amplifies locomotor-like muscle activity in spinal cord injured persons
N Kawashima, D Nozaki, MO Abe, M Akai, K Nakazawa
JOURNAL OF NEUROPHYSIOLOGY, 93, 2, 777, 785, AMER PHYSIOLOGICAL SOC, 2005年02月, ［査読有り］
英語, 研究論文（学術雑誌）, It is now well recognized that muscle activity can be induced even in the paralyzed lower limb muscles of persons with spinal cord injury (SCI) by imposing locomotion-like movements on both of their legs. Although the significant role of the afferent input related to hip joint movement and body load has been emphasized considerably in previous studies, the contribution of the "alternate" leg movement pattern has not been fully investigated. This study was designed to investigate to what extent the alternate leg movement influenced this "locomotor-like" muscle activity. The knee-locked leg swing movement was imposed on 10 complete SCI subjects using a gait training apparatus. The following three different experimental conditions were adopted: 1) bilateral alternate leg movement, 2) unilateral leg movement, and 3) bilateral synchronous (in-phase) leg movement. In all experimental conditions, the passive leg movement induced EMG activity in the soleus and medial head of the gastrocnemius muscles in all SCI subjects and in the biceps femoris muscle in 8 of 10 SCI subjects. On the other hand, the EMG activity was not observed in the tibialis anterior and rectus femoris muscles. The EMG level of these activated muscles, as quantified by integrating the rectified EMG activity recorded from the right leg, was significantly larger for bilateral alternate leg movement than for unilateral and bilateral synchronous movements, although the right hip and ankle joint movements were identical in all experimental conditions. In addition, the difference in the pattern of the load applied to the leg among conditions was unable to explain the enhancement of EMG activity in the bilateral alternate leg movement condition. These results suggest that the sensory information generated by alternate leg movements plays a substantial role in amplifying the induced locomotor-like muscle activity in the lower limbs.

バイオメカニクス的手法を用いた静止立位制御機構の解析 (特集:バイオメカニクスとモーターコントロール)
政二 慶, 阿部 匡樹
バイオメカニクス研究, 9, 1, 10, 17, 日本バイオメカニクス学会, 2005年, ［招待有り］
日本語

A New Model for Oxygen Uptake Kinetics in Heavy Exercise
矢野 徳郎, 尾方 寿好, 柚木 孝敬, Abe Masaki
北海道大学大学院教育学研究科紀要, 93, 1, 13, 北海道大学大学院, 2004年
英語

Modulation of elbow joint stiffness in a vertical plane during cyclic movement at lower or higher frequencies than natural frequency
MO Abe, N Yamada
EXPERIMENTAL BRAIN RESEARCH, 153, 3, 394, 399, SPRINGER-VERLAG, 2003年12月, ［査読有り］
英語, 研究論文（学術雑誌）, The purpose of the present study was to determine how joint stiffness during cyclic movement in a vertical plane is modulated at lower or higher frequencies than the natural frequency of the system. Five male subjects were instructed to swing their forearms rhythmically in a vertical plane under various frequency conditions (0.7-2.25 Hz). To estimate the mechanical properties of the elbow joint, external perturbations were applied by an electromagnetic torque motor system to the forearm of each subject during the movement. Joint stiffness showed a significant quadratic trend with a minimum close to the natural frequency of the apparatus-forearm system (1.09+/-0.08 Hz). The resonant frequency showed the similar tendencies to joint stiffness and was significantly different from movement frequency in the lower frequency range (0.7-0.9 Hz). In addition, the ratio of joint stiffness to the background torque (STratio) was greater in the frequency conditions below the natural frequency than in the frequency conditions above the natural frequency and was relatively constant in the latter. These results suggested that: (1) the modulation of joint stiffness for movement in a vertical plane, by which the resonant frequency of the system is kept close to the movement frequency, may be limited to the movement frequency range above the natural frequency; and (2), in the case of movement in a vertical plane, the mechanism by which joint stiffness is modulated may change according to the relation between natural frequency and movement frequency.

把持課題条件の違いによる到達運動と把持運動の時空的協調関係
後藤 美奈子, 阿部 匡樹, 山田 憲政
認知科学, 9, 4, 516, 531, 2002年, ［査読有り］
日本語, Human prehensile movements consist of two motor components: a transport component and a grasp component. The purpose of this study was to determine how the transport component is related to the grasp component in terms of spatiotemporal aspects such as the time series of a hand transport trajectory.Seven subjects were asked to point to a target (a circle of 2 cm in diameter) by using the right index finger or to grasp a disc (2, 4, 6, or 8 cm in diameter and 2 cm in length) between the thumb and index finger of the right hand. Both the target and disk were placed 30 cm directly in front of the starting position of the right hand.The results showed that: (1) As the size of the disk increased, the inclination of the hand in its final shape became larger; (2) As the inclination of the hand when grasping the disk became larger, both the peak and final heights of the wrist position during the hand transport movement increased; and (3) the hand aperture was related spatiotemporally to the change in the hand transport trajectory. These results suggest that transport and grasp components are coordinated spatiotemporally during human prehension movements.

Postural coordination patterns associated with the swinging frequency of arms
M Abe, N Yamada
EXPERIMENTAL BRAIN RESEARCH, 139, 1, 120, 125, SPRINGER-VERLAG, 2001年07月, ［査読有り］
英語, 研究論文（学術雑誌）, Voluntary arm movements frequently perturb body equilibrium in an upright posture. The motions of leg joints need to be coordinated according to the properties of voluntary arm movements in order to maintain body equilibrium, and this may cause a change in postural pattern. The purpose of this study was to determine whether the kinematic pattern generation of upright posture is influenced by a change in the swinging frequency of arm movements and whether the pattern generation is correlated with a change in joint torque about the shoulder joint. Four male subjects in an upright posture were instructed to swing their arms at seven different frequencies, determined by the maximum swinging frequency of each subject (35%max, 40 similar to 60%max, 65%max). Segment rotations around the shoulder, hip, and ankle joints were analyzed at kinematic and kinetic levels. The results of kinematic analysis indicated that tight coupling between motions of the shoulder and hip joints was generated in lower-frequency trials (under 40-45%max), whereas tight coupling between motions of the shoulder and ankle joints was generated in higher frequency trials (more than 40-45% max). Furthermore, the results of kinetic analysis revealed that changes in the joint torque patterns about the shoulder and hip joints occurred in trials at 40-45%max. The mean value of 40-45% max was close to the eigenfrequency of each subject's arm. We concluded that (1) postural patterns associated with a gradual change in the swinging frequency of the arms can be divided into two coordination modes (a hip-shoulder in-phase mode and an ankle-shoulder in-phase mode), and (2) these two patterns may be divided by the eigenfrequency of the arm.

神経系と筋骨格系の相互作用からみた身体運動の自己組織化 (特集 運動と複雑系・カオス)
山田 憲政, 阿部 匡樹
体育の科学, 51, 3, 197, 202, 杏林書院, 2001年03月, ［招待有り］
日本語

身体運動の絵画への埋め込み フェルメールが約３５０年前に捉えた女性の身振り:―フェルメールが約350年前に捉えた女性の身振り―
山田 憲政, 阿部 匡樹
認知科学, 7, 4, 330, 340, 2000年, ［査読有り］
日本語, Paintings convey static information in two-dimensional form. Human beings have tried to express three-dimensional space on a two-dimensional plane using techniques such as perspective. Attempts have also been made to express changes over time in humans and nature on a static plane. This procedure also requires some techniques for embodiment of the movements in a static canvas.In this study, we examined the embodied movement in the famous painting "The Milkmaid" by Vermeer. The painting was reconstructed in the three-dimensional space, and the movement embodied in the painting (i.e., the milk flowing from the jug) was analyzed.The results of analysis showed that the jug held by the maid must be moving slightly for the milk be to flowing from the jug. This implies that a slight arm movement was embodied by Vermeer in the maid's gesture in the painting, which is contrary to past interpretation of the painting.

運動に伴い生じる求心性情報の周期運動における役割
山田 憲政, 阿部 匡樹
認知科学, 6, 3, 346, 358, 日本認知科学会, 1999年09月01日, ［査読有り］
日本語

時系列デ-タにおける規則性の定量化--運動解析へのApproximate Entropyの適用
阿部 匡樹, 山田 憲政
バイオメカニクス研究, 2, 2, 82, 91, 日本バイオメカニクス学会, 1998年06月, ［査読有り］
日本語, Approximate Entropy (Ap entropy) was developed as a method to quantify regularity of time-series data. The aim of this study was to examine problems in the application of Ap entropy to human movement data and to distinguish movement patterns by quantifying the regularity of experimental human movement data. The following results were obtained: 1) For a relatively periodic time-series function with a small number of periods，difference in both the number of data points and number of periods affected the Ap entropy value. Thus，for the application of Ap entropy，the number of data points and the number of periods should be made the same. 2) Under the experimental conditions of this study，the change in the Ap entropy value was in accordance with subjective judgment of movement patterns. This indicates that Ap entropy is an effective parameter for quantitatively distinguishing movement patterns in data that differ in time-series regularity.

コンピューターとデジタルタブレットによる視野変換実験の設定　　　　　　　　　　　　　　　
阿部匡樹, 保延光一, 山田憲政
北海道体育学研究, 31, 53, 58, 1996年06月, ［査読有り］
日本語

スポーツ心理学：最高のパフォーマンスを発揮する「心」と「動き」の科学 勁草書房.　　　　　　　　　　　　　　　
阿部匡樹, 認知科学, 31, 1, 2024年03月
日本語, 書評論文,書評,文献紹介等

トヴェルスキー, B. 渡会圭子（訳）(2020). Mind in Motion：身体動作と空間が思考をつくる 森北出版　　　　　　　　　　　　　　　
阿部匡樹, 認知科学, 30, 2, 2023年06月
日本語, 書評論文,書評,文献紹介等

脳 brain　　　　　　　　　　　　　　　
阿部匡樹, ランニングマガジン・クリール（2022年5月号）, 74, 79, 2022年05月, ［招待有り］
日本語, 記事・総説・解説・論説等（商業誌、新聞、ウェブメディア）

ワークショップ 運動学習の最新理論 (学会大会報告(2013,日本体育大学))
阿部 匡樹, 門田 浩二, 宮崎 真, スポーツ心理学研究, 41, 1, 77, 79, 2014年
日本スポーツ心理学会, 日本語, 研究発表ペーパー・要旨（全国大会，その他学術会議）

日常と非日常からみるこころと脳の科学
宮崎 真, 阿部 匡樹, 山田 祐樹
コロナ社, 2017年, 9784339078145, 日本語

Motor Control: Theories, Experiments, and Applications　　　　　　　　　　　　　　　
Sternad D, Abe MO, Variability, noise, and sensitivity to error in learning a motor task
Oxford University Press, 2010年, 9780195395273, 511, 267-294, 英語, 学術書, ［共著］

経頭蓋交流電気刺激による共同力調整課題時の他者協調の修飾　　　　　　　　　　　　　　　
阿部匡樹, 松田 結梨
HCGシンポジウム2024, 2024年12月12日, 日本語, 口頭発表（一般）
2024年12月11日 - 2024年12月13日

観ることで上手くなる：運動観察学習の原理と応用　　　　　　　　　　　　　　　
阿部匡樹
大阪体育大学スポーツ科学セミナー, 2024年11月04日, 日本語
［招待講演］

他者とのインタラクション場面における誤差に基づく観察運動学習　　　　　　　　　　　　　　　
松田直祥, 阿部匡樹
第18回MotorControl研究会, 2024年08月23日, 日本語, 口頭発表（一般）
2024年08月22日 - 2024年08月24日

Self-other distinction in human communication: Sense of agency, joint action, and empathy　　　　　　　　　　　　　　　
Abe MO
PHENOMENOLOGY OF EMPATHY SERIES: CONCEPTUALIZATIONS, PATHOLOGIES, GENDER IMPLICATIONS, AND CLINICAL APPLICATIONS, 2023年09月01日, 英語, 口頭発表（招待・特別）
［招待講演］

コミュニケーションの神経科学：共同行為に潜む社会性　　　　　　　　　　　　　　　
阿部匡樹
運動と脳の勉強会第13回月例会, 2022年12月09日, 日本語, 公開講演，セミナー，チュートリアル，講習，講義等
2022年12月09日 - 2022年12月09日, ［招待講演］

共同行為の神経基盤を探る：Hyperscanning fMRIによる挑戦　　　　　　　　　　　　　　　
阿部匡樹
第63回日本社会心理学会ワークショップ「学際的な社会⼼理学の構築を目指して ―若⼿研究者のための教育講演―」, 2022年09月15日, 日本語, 口頭発表（招待・特別）
2022年09月14日 - 2022年09月15日, ［招待講演］

健常者における運動主体感の主観的な異常性と行為－結果の時間知覚の関係　　　　　　　　　　　　　　　
松田直祥, 阿部匡樹
第16回MotorControl研究会, 2022年08月26日, 日本語, ポスター発表
2022年08月25日 - 2022年08月27日

Implicit motor adjustment based on errors caused by external sources　　　　　　　　　　　　　　　
Matsuda N, Abe MO
NEURO2022, 2022年07月01日, 英語, ポスター発表
2022年06月30日 - 2022年07月03日

効果的な運動観察法の検討：大事なのは視点？それともリズム？　　　　　　　　　　　　　　　
佐々木悠介, 阿部匡樹
2022年度生理学研究所研究会「スポーツからみる 日常と非日常の神経生理学」, 2022年03月28日, 日本語, ポスター発表
2022年03月28日 - 2022年03月28日

健常者における運動主体感の異常性と行為－結果の遅延算出能力の関係　　　　　　　　　　　　　　　
松田直祥, 阿部匡樹
2022年度生理学研究所研究会「スポーツからみる 日常と非日常の神経生理学」, 2022年03月28日, 日本語, ポスター発表
2022年03月28日 - 2022年03月28日

模倣抑制トレーニングが表情認知に及ぼす影響　　　　　　　　　　　　　　　
松田直祥, 阿部匡樹
日本心理学会第85回大会, 2021年09月, 日本語, ポスター発表
2021年09月01日 - 2021年09月08日

退くか、担うか、寄り添うか： 共同行為に潜む社会的意思決定　　　　　　　　　　　　　　　
阿部匡樹
北海道大学社会科学実験研究センター（CERSS）コロキウム, 2021年07月08日
［招待講演］

The effect of transcranial direct current stimulation of the pre-supplementary motor area on the imitation-inhibition task depends on the autism spectrum traits.　　　　　　　　　　　　　　　
Matsuda N, Abe MO
SfN Global Connectome, 2021年01月, 英語, ポスター発表
2021年01月11日 - 2021年01月13日

共同行為における社会性:他者との協調を司る神経基盤を探る　　　　　　　　　　　　　　　
阿部匡樹
日本心理学会 認定心理士の会主催シンポジウム「社会関係を実証する心理学」, 2019年10月06日, 日本語, 口頭発表（招待・特別）
［招待講演］, ［国内会議］

コミュニケーションを紐解く ―Social scienceへの学際的アプローチ―　　　　　　　　　　　　　　　
阿部匡樹
リハビリテーション科学・スポーツ科学研究交流会, 2018年12月22日
滋賀, ［招待講演］

自己と他者のあいだ：個人間協応に潜むルール　　　　　　　　　　　　　　　
阿部匡樹
山梨大学大学院特別教育プログラム（協応行動科学）公開セミナー, 2018年11月08日
山梨, ［招待講演］

たとえば君がいるだけで：「他者」が運動に与える影響　　　　　　　　　　　　　　　
阿部匡樹
第29回フィットネスデザイン交流会, 2017年09月20日
北海道, ［招待講演］

他者の存在が運動制御にもたらすもの　　　　　　　　　　　　　　　
阿部匡樹
第11回Motor Control研究会シンポジウム（Motor Controlにおける「他者」の影響）, 2017年08月25日
愛知

コミュニケーション上手は手抜き上手？共同力調整課題における個人間の相互作用とその神経基盤　　　　　　　　　　　　　　　
阿部匡樹
第８回静岡大学脳情報学セミナー, 2017年07月14日
静岡, ［招待講演］

コミュニケーションの神経科学：共同行為に潜む運動制御と社会性　　　　　　　　　　　　　　　
阿部匡樹
第10回運動神経科学研究会脳神経科学札幌セミナー, 2016年09月04日
北海道, ［招待講演］

運動と社会性：共同運動課題に潜む“私”と“他者”　　　　　　　　　　　　　　　
阿部匡樹
第18回日本体力医学会北海道地方会学術集会, 2016年04月23日
北海道, ［招待講演］

Spontaneous organization in joint action　　　　　　　　　　　　　　　
Abe MO
International Symposium for Integrated Understanding for Emergent Property of Cooperation and Competition Dynamics (The University of Tokyo), 2016年03月03日
Tokyo, ［招待講演］

他者とのインタラクションに関与する神経基盤の同定　　　　　　　　　　　　　　　
阿部匡樹
平成27年度生理研研究会「コミュニケーションを可能にする神経機構の解明」, 2015年11月12日
愛知, ［招待講演］

Interpersonal coordination in joint action: Effect of embodied sociality　　　　　　　　　　　　　　　
Abe MO
Workshop on Perception, Cognition, and Action (National Taiwan University), 2013年12月20日
Taipei, ［招待講演］

運動学習概論：計算論的アプローチの魅力に迫る　　　　　　　　　　　　　　　
阿部匡樹
日本スポーツ心理学会40回大会（ワークショップ「運動学習の最新理論」）, 2013年11月02日
東京

Interpersonal coordination in joint action　　　　　　　　　　　　　　　
Abe MO
Perception-action dynamics of human behavior（首都大学東京人間健康科学研究科知覚運動研究室ワークショップ）, 2013年06月19日
東京, ［招待講演］

Effect of partner’s presence during practice on subsequent joint action　　　　　　　　　　　　　　　
Abe MO, Watanabe K
5th International Conference on Knowledge and Smart Technologies (KST-2013), 2013年01月31日
Thailand

Two brains meet a task: 個人間共同運動制御における組織化　　　　　　　　　　　　　　　
阿部匡樹
北陸先端科学技術大学院大学情報科学研究科セミナー, 2012年08月01日
石川, ［招待講演］

Effect of prior information about partner performance on goal-directed joint action　　　　　　　　　　　　　　　
Abe MO, Watanabe K
The 35th Annual Meeting of the Japan Neuroscience Society, 2012年07月28日
愛知

滞米時、帰国後、そしてこれから：Intrapersonal systemからInterpersonal systemへ　　　　　　　　　　　　　　　
阿部匡樹
第９回スポーツ技能の獲得・向上への力学系理論からの統合的理解に関する研究会, 2011年03月01日
愛知, ［招待講演］

冗長性のある標的課題における運動適応：運動のばらつきの影響を抑えるには？　　　　　　　　　　　　　　　
阿部匡樹
東京大学大学院生命環境科学系身体運動科学研究室セミナー, 2010年12月01日
東京, ［招待講演］

変えるべきか、変えないべきか、それが問題だ：身体の不確かさと運動の調整　　　　　　　　　　　　　　　
阿部匡樹
日本スポーツ心理学会自主シンポジウム, 2010年11月01日
広島

Exploitation and adaptation of optimal solutions in a redundant throwing task　　　　　　　　　　　　　　　
Abe MO
Newman lab and Action lab ‘Advance’, 2010年01月01日
USA

冗長性のある運動課題における誤差修正の最適化過程　　　　　　　　　　　　　　　
阿部匡樹
東京大学大学院教育学研究科野崎研究室セミナー, 2009年08月01日
東京, ［招待講演］

静止立位時における左右ヒラメ筋の同期的活動 -8-12Hzの振戦に注目して-　　　　　　　　　　　　　　　
阿部匡樹
第23回筋電図の会, 2006年09月01日
兵庫, ［招待講演］

Fractal characteristics of ground reaction force time-series while standing and walking: Are they correlated?　　　　　　　　　　　　　　　
Abe MO, Nakazawa K, Masani K, Akai M
XVth Congress of the International Society of Electrophysiology & Kinesiology, 2004年06月01日
USA