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The Effect of Direction on Biological Motion Perception: an ERP Study

Denomination Maîtrise universitaire interdisciplinaire en neurosciences
Defense Maîtrise d'études avancées : Univ. Genève, 2014
Abstract The importance of detecting the movement of others’ is crucial to interpret their intentions and anticipate social interactions. Biological motion (BM) perception has interrogated researchers and investigations have been conducted during the past decades in order to elucidate its neural processing. However the effect of the movement direction has not yet been established. Using point light animations we explored the temporal processing of biological motion perception in different directions: towards or away from the observer (in-depth motion), in the left or right directions (in-plane motion). With event related potential analysis we investigated the waveforms of specific components and found enhanced amplitudes comparing all the BM stimuli with the scrambled motion (SM) control stimuli. These differences were found from 90 ms and up to 800 ms over an occipito-parietal site. A topographic analysis confirmed periods of differences in the processing from 160 ms. The potential sources of these topographic maps were identified in a broad network comprising a major part of the temporal and occipital lobes using a source localization analysis. Not only the existence of a specific BM processing has been shown,but also early (80 - 150 ms) as well as late (550 - 780 ms) differences were observed for BM moving in depth compared to BM moving in plane. Indeed enhanced amplitudes for the in-depth direction were found over an occipito-parietal site. We also observed modulations from 170 ms between forward and backward motion for both BM and SM stimuli. Our findings show that the direction motion feature affects BM and SM perception differently from an early stage of the processing. This suggests the biological relevance of social interactions depicted by moving towards or away from the observer
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Research group Neuropsychologie expérimentale
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GEHRING, Elise. The Effect of Direction on Biological Motion Perception: an ERP Study. Université de Genève. Maîtrise d'études avancées, 2014. https://archive-ouverte.unige.ch/unige:74040

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Deposited on : 2015-07-10

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