研究者詳細 - 平井　真洋

論文 - 平井　真洋

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Allocation of attention to biological motion: Local motion dominates global shape 査読有り

Masahiro Hirai, Daniel R. Saunders, Nikolaus F. Troje

JOURNAL OF VISION 11 巻 ( 3 ) 2011年

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ASSOC RESEARCH VISION OPHTHALMOLOGY INC

Directional information can be retrieved from a point-light walker (PLW) in two different ways: either from recovering the global shape of the articulated body or from signals in the local motion of individual dots. Here, we introduce a voluntary eye movement task to assess how the direction of a centrally presented, task-irrelevant PLW affects the onset latency and accuracy of saccades to peripheral targets. We then use this paradigm to design experiments to study which aspects of biological motion-the global form mediated by the motion of the walker or the local movements of critical features-drive the observed attentional effects. Putting the two cues into conflict, we show that saccade latency and accuracy were affected by the local motion of the dots representing the walker's feet-but only if they retain their familiar, predictable location within the display.

DOI： 10.1167/11.3.4

Web of Science

Neural correlates of face and object perception in an awake chimpanzee (Pan troglodytes) examined by scalp-surface event-related potentials. 査読有り

Fukushima H, Hirata S, Ueno A, Matsuda G, Fuwa K, Sugama K, Kusunoki K, Hirai M, Hiraki K, Tomonaga M, Hasegawa T

PLoS One 5 巻 ( 10 ) 頁： e13366 2010年10月

Occipital-parietal network prepares reflexive saccades. 査読有り

Watanabe M, Hirai M, Marino RA, Cameron IG

J Neurosci. 30 巻 ( 42 ) 頁： 13917 - 13918 2010年10月

Developmental changes in point-light walker processing during childhood and adolescence: an event-related potential study. 査読有り

Hirai M, Watanabe S, Honda Y, Kakigi R

Neuroscience 161 巻 ( 1 ) 頁： 311 - 325 2009年6月

Differential orientation effect in the neural response to interacting biological motion of two agents 査読有り

Masahiro Hirai, Ryusuke Kakigi

BMC NEUROSCIENCE 10 巻頁： 39 2009年4月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：BIOMED CENTRAL LTD

Background: A recent behavioral study demonstrated that the meaningful interaction of two agents enhances the detection sensitivity of biological motion (BM), however, it remains unclear when and how the 'interaction' information of two agents is represented in our neural system. To clarify this point, we used magnetoencephalography and introduced a novel experimental technique to extract a neuromagnetic response relating to two-agent BM perception. We then investigated how this response was modulated by the interaction of two agents. In the present experiment, we presented two kinds of visual stimuli (interacting and non-interacting BM) with two orientations (upright and inverted).
Results: We found a neuromagnetic response in the bilateral occipitotemporal region, on average 300-400 ms after the onset of a two-agent BM stimulus. This result showed that interhemispheric differences were apparent for the peak amplitudes. For the left hemisphere, the orientation effect was manifest when the two agents were made to interact, and the interaction effect was manifest when the stimulus was inverted. In the right hemisphere, the main effects of both orientation and interaction were significant, suggesting that the peak amplitude was attenuated when the visual stimulus was inverted or made to interact.
Conclusion: These results demonstrate that the 'interaction' information of two agents can affect the neural activities in the bilateral occipitotemporal region, on average 300-400 ms after the onset of a two-agent BM stimulus, however, the modulation was different between hemispheres: the left hemisphere is more concerned with dynamics, whereas the right hemisphere is more concerned with form information.

DOI： 10.1186/1471-2202-10-39

Web of Science

Neural basis of stable perception of an ambiguous apparent motion stimulus. 査読有り

Kaneoke Y, Urakawa T, Hirai M, Kakigi R, Murakami I

Neuroscience. 159 巻 ( 1 ) 頁： 150 - 160 2009年3月

Intact point-light walker processing in Williams syndrome: a magnetoencephalography study. 査読有り

Hirai M, Nakamura M, Kaneoke Y, Kakigi R

Neuroreport. 20 巻 ( 3 ) 頁： 267 - 272 2009年2月

ヒトが感じるヒトの存在感 - バイオロジカルモーションとその周辺- 招待有り

平井真洋

日本バーチャルリアリティ学会誌 14 巻 ( 1 ) 頁： 18 - 23 2009年

Differential cortical processing of local and global motion information in biological motion: An event-related potential study 査読有り

Masahiro Hirai, Ryusuke Kakigi

Journal of Vision 8 巻 ( 16 ) 頁： 1 - 17 2008年12月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ASSOC RESEARCH VISION OPHTHALMOLOGY INC

To reveal the neural dynamics underlying biological motion processing, we introduced a novel golf-swing point-light motion (PLM) stimulus with an adaptation paradigm and measured event-related potentials (ERPs). In the adaptation phase, PLM and scrambled PLM (sPLM) stimuli were presented
a static point-lights stimulus was also presented as a control condition. In the subsequent test phase, PLM or sPLM stimuli were presented. We measured ERPs from the onset of the test phase. Two negative components were observed and modulated differently: the amplitude of the N1 component was significantly attenuated by PLM and sPLM adaptation stimuli compared with the static point-light adaptation stimulus, whereas the amplitude of the N2 component in response to the PLM test stimulus was significantly attenuated only by the PLM adaptation stimulus. The amplitude of the N2 component in response to the PLM test stimulus was significantly larger than that in response to the sPLM test stimulus when a sPLM or static adaptation stimulus was used. These findings indicate that the N1 component is sensitive to local motion information while the N2 component is sensitive to the presence of a coherent form conveyed by global motion. © ARVO.

DOI： 10.1167/8.16.2

Web of Science

Scopus

PubMed

Neural responses related to point-light walker perception: a magnetoencephalographic study. 査読有り

Hirai M, Kaneoke Y, Nakata H, Kakigi R

Clin Neurophysiol. 119 巻 ( 12 ) 頁： 2775 - 2784 2008年12月

Emotional object and scene stimuli modulate subsequent face processing: an event-related potential study. 査読有り

Hirai M, Watanabe S, Honda Y, Miki K, Kakigi R

Brain Res Bull. 77 巻 ( 5 ) 頁： 264 - 273 2008年9月

Evoked magnetic fields following noxious laser stimulation of the thigh in humans. 査読有り

Nakata H, Tamura Y, Sakamoto K, Akatsuka K, Hirai M, Inui K, Hoshiyama M, Saitoh Y, Yamamoto T, Katayama Y, Kakigi R

Neuroimage 42 巻 ( 2 ) 頁： 858 - 868 2008年8月

Differential neural responses to humans vs. robots: an event-related potential study. 査読有り

Hirai M, Hiraki K

Brain Res. 1165 巻頁： 105 - 115 2007年8月

Visual search for biological motion: An event-related potential study 査読有り

Masahiro Hirai, Kazuo Hiraki

Neuroscience Letters 403 巻 ( 3 ) 頁： 299 - 304 2006年8月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

To investigate the neural response to detection of biological motion (BM) surrounded by distractors, event-related potentials (ERPs) were recorded. Scrambled motion with the same velocity vector as the BM but randomized initial starting points was used as the distractor. The number of distractors was varied to control the difficulty of the task. The behavioral data showed that the reaction time increased with the number of distractors. Moreover, the ERP results showed that enhanced negativity was elicited at posterior electrodes contralateral to the location of the BM as with the conventional N2pc-like component, which is related to selection of the target. The increment of reaction time indicated that the attentional process is involved in the detection of BM. Furthermore, the ERP waveforms suggest that, even when detection of the target requires form-from-motion processing, similar neural mechanisms to those involved in conventional visual search tasks were employed here. © 2006 Elsevier Ireland Ltd. All rights reserved.

DOI： 10.1016/j.neulet.2006.05.002

Scopus

PubMed

The relative importance of spatial versus temporal structure in the perception of biological motion: An event-related potential study 査読有り

M Hirai, K Hiraki

COGNITION 99 巻 ( 1 ) 頁： B15 - B29 2006年2月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

We investigated how the spatiotemporal structure of animations of biological motion (BM) affects brain activity. We measured event-related potentials (ERPs) during the perception of BM under four conditions: normal spatial and temporal structure; scrambled spatial and normal temporal structure; normal spatial and scrambled temporal structure; and scrambled spatial and temporal structure. As in a previous study, we identified two negative components at both occipitotemporal regions: N210 reflected general motion processing while N280 reflected the processing of BM. We analyzed the averaged ERPs in the 200-300 ms response time window and found that spatial structure had a substantial effect on the magnitude of the averaged response amplitude in both hemispheres. This finding suggests that spatial structure of point-lights elicits a stronger response in the occipitotemporal region than temporal structure for the BM perception. (C) 2005 Published by Elsevier B.V.

DOI： 10.1016/j.cognition.2005.05.003

Web of Science

An event-related potentials study of biological motion perception in human infants. 査読有り

Hirai M, Hiraki K

Brain Res Cogn Brain Res. 22 巻 ( 2 ) 頁： 301 - 304 2005年2月

Active processing of biological motion perception: an ERP study. 査読有り

Hirai M, Hiraki K

Brain Res Cogn Brain Res. 23 巻 ( 2-3 ) 頁： 387 - 396 2005年1月

Neural dynamics in human imitation revealed by ERP surface topography 査読有り

H Fukushima, M Hirai, A Arita, K Kamewari, K Hiraki

NEUROREPORT 15 巻 ( 13 ) 頁： 2129 - 2132 2004年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：LIPPINCOTT WILLIAMS & WILKINS

To clarify the neural dynamics in human motor imitation, we examined event-related potentials (ERP) for a reaction time task that required responses to an actor's finger motions with identical motions. Compared with a control task (reaction to an LED illumination), the ERP surface topography in the imitative reaction was differentiated at around 120-200 ms post-cueing, showing an early sensitivity to the response hand over the pre-central region. This result suggested that activities around the motor areas were facilitated in the imitative reaction, which is consistent with recent neuroimaging studies. However, taken together with that there were no differences in reaction times, the early ERP latency of conditional divergence indicated that neural activities related to imitation are visual responses and do not directly lead to motor acceleration.

DOI： 10.1097/00001756-200409150-00026

Web of Science

An event-related potentials study of biological motion perception in humans 査読有り

M Hirai, H Fikushima, K Hiraki

NEUROSCIENCE LETTERS 344 巻 ( 1 ) 頁： 41 - 44 2003年6月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCI IRELAND LTD

In order to clarify the neural dynamics involved in the perception of biological motion, we recorded event-related potentials from 12 subjects. The subjects were shown biological motion or scrambled motion as a control stimulus. In the scrambled motion, each point had the same velocity vector as in the biological motion, but the initial starting positions were randomized. The perception of both biological and scrambled motion elicited negative peaks at around 200 (N200) and 240 ms (N240). Furthermore, both negative peaks were significantly larger in the biological motion condition than in the scrambled motion condition over the right occipitotemporal region. In light of previous human neuroimaging studies, we speculate that component N200 is generated near the extrastriate cortex area and N240 is generated from the superior temporal sulcus region. (C) 2003 Elsevier Science Ireland Ltd. All rights reserved.

DOI： 10.1016/S0304-3940(03)00413-0

Web of Science

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