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Multisensory Action Control and Spatial Coding| old_uid | 7318 |
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| title | Multisensory Action Control and Spatial Coding |
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| start_date | 2009/07/20 |
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| schedule | 16h |
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| online | no |
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| location_info | /, salle de conférence |
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| summary | Locating objects in space and performing goal-directed actions are highly dependent on vision, because it provides the most reliable spatial information. But how are these functions accomplished on the basis of kinesthetic and proprioceptive information? To address this question, we first investigated the neural correlates of kinesthetic action control in congenitally blind and sighted participants using fMRI. To this end, participants traced different line patterns with a stylus without visual feedback. Secondly, we investigated how proprioceptive and visual action targets are represented in space. Therefore, sighted participants performed passively guided reaching movements to memorized target locations while they varied gaze. The fMRI data showed that kinesthetic action control activates a fronto-parietal network in both congenitally blind and sighted participants covering posterior parietal and premotor areas. In addition, group-specific activations were found in primary sensory cortices for congenitally blind adults and in action-related brain areas for sighted adults. Regarding spatial coding, subjects misestimated both the visual and the proprioceptive target locations in the opposite direction of the gaze position. Our results suggest a multimodal network of action control that develops on the basis of visual and non-visual feedback and codes spatial information in a common reference frame anchored to the eye. |
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| responsibles | Farnè, Béranger, Soulier |
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