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L'étude de l'influence du contexte sur la poursuite oculaire

Abstract : Pursuit eye movements allow us to track a target which moves continuously and slowly in our visual environment. Studies have shown this movement is based on the simultaneous contribution of retinal signals linked to the retinal image of the visual target and to the context, on extra retinal signals underlying cognitive process and the efference copy, and some inhibition and suppression processes related to the visual context. This dynamical combination allows the pursuit system to adapt in a wide range of contexts. If the presence of a motion signal in the visual environment is thought as a prerequisite to initiate and then to maintain the pursuit, some results since the 70’s moderate this view. In order to investigate the mechanisms underlying the maintenance of pursuit eye movements after target disappearance and the nature of signals leading to generate pursuit, we investigate the effects of two different contexts. These contexts, a visual one, and an auditory one, share the same property which is to be dependent on eye movements. As a result of this dependence, the contexts yield a new signal, visual or auditory, which carry an information about the ongoing eye movement. We study the effects of these information induced by the contexts in procedure involving the generation and the maintenance of smooth pursuit eye movements, and the generation of smooth and continuous eye movements without a moving target.
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Submitted on : Friday, December 22, 2017 - 1:01:14 AM
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  • HAL Id : tel-01671165, version 1

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Arthur Portron. L'étude de l'influence du contexte sur la poursuite oculaire. Sciences cognitives. Université Pierre et Marie Curie - Paris VI, 2017. Français. ⟨NNT : 2017PA066123⟩. ⟨tel-01671165⟩

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