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Orientation volontaire de l’attention visuelle chez l’homme et le macaque Rhésus

Abstract : Visual attention is a critical process to a correct perception of our visual environment.This term includes all mechanisms involved in the selection of information in order to processit in priority. It is generally proposed that voluntary orientation of attentional capacity is a220slow and sustained process, while unvoluntary orientation is fast. We show here by apsychophysical study that voluntary orientation is in fact a rapid process that is easely maskedby others cognitiv process of general engagement.This phenomenon is sustained by a large network of cerebral areas, including the Frontal Eye Field (FEF), and the Lateral IntraParietal area (LIP). We recorded neuronal activity of 2monkey’s FEF and LIP neuronal activity while they were engaged in a attentional task. Weshow here that these 2 areas play 2 crucial differents roles. Contrary to FEF, that is highlyinvolved in attentional orientation and engagement, LIP neuronal activity present few attentional modulations. LIP and FEF cells present large cognitive activities selectives to selection of the important event of the task. We hypothesis that FEF controles the voluntary orientation of visual attention while LIP detects the target.More over, we highly the existence of a new FEF’s cell category involved in the executive control of cognitives function (as attentional).
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Submitted on : Tuesday, December 20, 2011 - 2:49:09 PM
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  • HAL Id : tel-00653876, version 1


Guilhem Ibos. Orientation volontaire de l’attention visuelle chez l’homme et le macaque Rhésus. Médecine humaine et pathologie. Université Claude Bernard - Lyon I, 2009. Français. ⟨NNT : 2009LYO10109⟩. ⟨tel-00653876⟩



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