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Interaction between the saccadic program and visual perception| old_uid | 5165 |
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| title | Interaction between the saccadic program and visual perception |
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| start_date | 2008/06/24 |
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| schedule | 16h |
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| online | no |
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| summary | Eye movements represent often an ideal model of the dynamic coupling between perception and action for the cognitive neurosciences. In primates, rapid and accurate shifts of the gaze direction permit to bring the regions of interest in the scene to the center of the visual field, where visual acuity is highest. An optimal dynamic interaction between visual processing and oculomotor control is therefore crucial for high-level visual performances. Surprisingly, however, very few experimental studies have addressed the functional role of eye movements to optimize visual performance.
I will present different experimental paradigms designed to investigate the visuo-oculomotor interaction under this point of view. Human eye movement recordings and the corresponding measures of visual performance will be illustrated. For some tasks, the visuo-oculomotor interaction will be explained in terms of an underlying theoretical model based on the representation of saccadic programming as a Decision-making problem.
First, I will analyse the effects of the perceptual consequences of a given oculomotor strategy on the preparation and execution of saccadic eye movements. Second, I will illustrate the dynamic competition between oculomotor programming and a top-down instruction to inhibit the intended movement. Third, I will present recent results about the spatio-temporal modulation of visual performance (visual selective attention) observed during saccadic preparation. In particular, I will discuss the time-course of the presaccadic visuo-oculomotor interaction in light of recent electrophysiological and modelling studies on the cerebral control of saccadic eye movements. |
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| responsibles | Farnè, Béranger, Soulier |
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