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Traitement cortical de l'espace visuel tridimentionnel dans l'aire visuelle primaire du singe vigile

Abstract : In the central part of the visual field, horizontal retinal disparity is directly involved in stereoscopic vision processing. Its role in the peripheral visual field is unclear as that of vertical disparity.
By performing extra-cellular recordings in behaving monkeys, we show that horizontal disparity is specifically encoded in the foveal representation of the visual field in the primary visual cortex (area V1). In the peripheral field however, we find that vertical disparity is truly encoded with tuning profiles similar to those of horizontal disparity. At such retinal eccentricies both types of disparities interact strongly, dependently on the preferred orientation axis of the receptive fields as predicted by the binocular energy model. This functional organization should participate to the neural processing involved in constructing stereoscopic percept at large retinal eccentricities. In addition to the modulation of visual activity by the gaze direction that we also show in the peripheral area V1, our results demonstrate that the primary visual cortex is organized functionally for an early neural processing of visual 3-D space reconstruction.
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Submitted on : Friday, January 19, 2007 - 2:01:24 PM
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Jean-Baptiste Durand. Traitement cortical de l'espace visuel tridimentionnel dans l'aire visuelle primaire du singe vigile. Neurosciences [q-bio.NC]. Université Paul Sabatier - Toulouse III, 2004. Français. ⟨tel-00125420⟩

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