Andersen R A, Buneo C, Pesaran B, 2004, "Coordinate transformations for sensory-guided movements" Perception 33 ECVP Abstract Supplement
Coordinate transformations for sensory-guided movements
R A Andersen, C Buneo, B Pesaran
Sensory-guided behaviours require a coordinate transformation between sensory and motor representations. In the posterior parietal cortex, a part of the brain involved in this transformation process, auditory and visual signals converge on subregions involved in the planning of saccades and reaches. Interestingly, many of the neurons represent the locations of the targets in a visual (retinotopic) frame of reference. This common reference frame may reflect the predominance of vision in primates and may facilitate hand - eye coordination. The activity in the spatial maps for reaching and saccades is updated with each eye movement when subjects are planning reaches. However, under natural-viewing conditions where subjects generally make many eye movements and only a few reaches, the reach planning activity in a population of cells occurs just before the reach. As a result, normally these reach-specific neurons do not require adjustments in their activity to compensate for eye movements. The relationship of the activity that occurs just prior to reaching in natural conditions to delay activity that is seen under more constrained experimental conditions is the subject of current experiments.
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