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Coding for reaching and grasping in the monkey medial posterior parietal cortex: Refining the role of the dorsal visual stream in action| old_uid | 9711 |
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| title | Coding for reaching and grasping in the monkey medial posterior parietal cortex: Refining the role of the dorsal visual stream in action |
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| start_date | 2011/02/24 |
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| schedule | 15h30 |
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| online | no |
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| location_info | Groupement Hospitalier Est-
Centre Commun- Bât B13, Rez-de-jardin |
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| details | invitation de l'Equipe Pélisson "ImpAct" |
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| summary | Since the pioneering studies of the 70’s, single cell recordings in the behaving monkeys have revealed that the posterior parietal cortex is involved in the visual control of prehensile movements. The inferior parietal lobule was suggested to mediate the visuomotor integration processes needed for grasping, whereas the superior parietal lobule was considered related to the visual control of reaching movements. These findings have suggested a role for the dorsomedial visual stream in reaching and for the dorsolateral visual stream in grasping. Recently it has been reported by our group that the neural activity in a region of the medial posterior parietal cortex (area V6A) is modulated by the preparation and execution of arm movements aimed at both reaching and grasping visual objects. In particular, we have found that V6A neurons are modulated by the direction of movement in reach-to-point tasks, as well as by grasp movements in reach-to-grasp tasks performed with different wrist orientations. V6A neurons also code hand preshaping and grip formation during grasping of different objects. In other words, area V6A appears to be involved in controlling/monitoring the act of prehension as a whole and not only the proximal aspects of arm movements. These findings can provide useful tools to address and interpret the study of human brain functions. |
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| responsibles | Koenig |
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