|
From retinal signals to oculomotor commands : the medio-posterior cerebellum and the control of target foveation| old_uid | 5172 |
|---|
| title | From retinal signals to oculomotor commands : the medio-posterior cerebellum and the control of target foveation |
|---|
| start_date | 2008/06/26 |
|---|
| schedule | 13h45 |
|---|
| online | no |
|---|
| location_info | salles des thèses |
|---|
| 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 medio-posterior 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 the spatial congruence is ensured by the output of the medio-posterior cerebellum, the caudal fastigial nuclei (cFN).
After defining the time window during which they influence saccade generation, we will see how the cFN contribute to the control of orienting movements when the head participates in the orienting response, and how they 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 cFN could influence the dynamic weighing of visual-to-motor channels. |
|---|
| responsibles | <not specified> |
|---|
| |
|