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Subcortical mechanisms for the saccadic control of target foveation| old_uid | 5281 |
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| title | Subcortical mechanisms for the saccadic control of target foveation |
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| start_date | 2008/09/19 |
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| schedule | 14h30 |
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| online | no |
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| summary | For orienting the fovea toward a visual target, retinal signals must be translated into
appropriate oculomotor commands. This orienting response associates a particular set of
extraocular muscle contractions to each retinal location when the head does not move.
Among the several brain regions involved in the foveation mechanisms, the medioposterior cerebellum plays a major role because its dysfunction alters the spatial congruence between target location and gaze orientation.
During my talk, I will present results of experiments which were designed to understand
how this spatial congruence is ensured by a subcortical network which is under the control of the medio-posterior cerebellum (MPC).
After defining the time window during which the MPC influences saccade generation, we
will examine how it contributes to the control of orienting movements when the head
participates in the orienting response, and how it can alter the topology of active neurons in the collicular motor map. Then, we will see what the study of the coupling between the horizontal and vertical components during oblique saccades suggests about the possible functional sites where the MPC could influence the dynamic weighing of visual-to-motor channels. |
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| responsibles | Riehle |
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