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A new psychophysiological approach to visuo-spatial attention| old_uid | 148 |
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| title | A new psychophysiological approach to visuo-spatial attention |
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| start_date | 2005/11/07 |
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| schedule | 11h-13h |
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| online | no |
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| details | Invité par Florian Waszak (Equipe Perception Visuelle) |
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| summary | Recent theories on visual attention propose a distinction between the control and the expression of information processing within the attentional system. Expression, in these models, means both the location and the content of relevant visual information. The generation of these representations is assumed to be the emergent outcome of perceptual processes that are guided both by stimulus feature and top-down control (i.e. the goals of the observer). According to this assumption, localisation of relevant
information should vary in efficiency and speed depending on the difficulty to extract relevant information from a complex scene. In a number of different tasks, one can show that posterior asymmetries of the EEG are reliable correlates of tagging relevant information. They vary in latency with the effort to extract relevant information from a given display.
Moreover, even single salient events in a visual scene seem to be captured by the same mechanism. Electrophysiological correlates indicate that selection processes might be comparable for bottom-up and top-down driven attentional processes. These processes appear to be a function of visual processing rather than of supramodal control of cortical resources. |
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| responsibles | Cohen |
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