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Quand un et un font ..un : perception holistique d'une pluralité de corps| title | Quand un et un font ..un : perception holistique d'une pluralité de corps |
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| start_date | 2023/02/17 |
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| schedule | 11h30-12h30 |
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| online | no |
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| location_info | salle A3-317 |
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| summary | Human faces and bodies are environmental stimuli of special importance that the brain processes with selective attention and a highly specialized visual system. It has been shown recently that the human brain also has dedicated networks for perception of pluralities of human bodies in synchronous motion or in face-to-face interaction. We used an EEG frequency tagging technique allowing the dissociation of the brain activity related to the component parts of an image from the activity related to the global image configuration. We presented to participants images of two silhouettes flickering at different frequencies (5.88 vs. 7.14 Hz). Clear response at these stimulation frequencies reflected response to each part of the dyad. An emerging intermodulation component (7.14 + 5.88 = 13.02 Hz), a nonlinear response regarded as an objective signature of holistic representation, was significantly enhanced in the (typical) upright relative to an (altered) inverted position. Moreover, our data suggest the presence of a trade-off between the processing of the global dyad configuration and that of the structural properties of the dyad elements. Hence the perception of the human form might be of a fundamentally different nature when it is part of a plurality. |
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| responsibles | Conty |
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Workflow history| from state (1) | to state | comment | date |
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| submitted | published | | 2023/02/08 14:09 UTC |
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