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Role of extraretinal monitoring signals in the perceptual integration of space across eye movements| old_uid | 9206 |
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| title | Role of extraretinal monitoring signals in the perceptual integration of space across eye movements |
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| start_date | 2010/10/29 |
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| schedule | 11h-12h30 |
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| online | no |
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| details | invité par T. Collins |
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| summary | In everyday life, we continuously sample our visual environment by rapid sequences of saccadic eye movements and intervening brief fixations. For the successful integration of visual information into a coherent scene representation the visuo-motor system needs to deal with these constant self-induced displacements of the visual input on our retinae and distinguish them from motion in the outside world. Internal forward models may help to solve this problem: The brain may use an internal monitoring signal associated with the oculomotor command to predict the visual consequences of the corresponding saccadic eye movement and compare this prediction with the actual postsaccadic visual input. Recent neurophysiological studies in primates identified one candidate pathway for an internal monitoring signal that ascends from the superior colliculus to the frontal cortex, relayed by medial parts of the thalamus. I will present psychophysical work on perisaccadic and transsaccadic space perception in normal control subjects and from a recent case study in a patient with a lesion affecting trans-thalamic monitoring pathways. Our findings point towards an important role of internal monitoring signals for perceptuo-motor integration and conscious visual perception across eye movements. Internal monitoring signals may be important for the correct attribution of self-induced versus externally imposed changes in the continuous flow of our sensory experiences. |
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| responsibles | Rämä |
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