Abstract

The neuronal activity of different nuclei of the thalamus and striopallidar complex was investigated in Parkinsonian patients with intracerebral electrodes chronically implanted in these structures for diagnostic and therapeutic purposes. Neuronal populations were discovered responding differently to the presentation of stimuli identical in all but angle of presentation, some of which responded solely to a single orientation and might therefore be thought of as displaying directional sensitivity. It is suggested that when motor and visual information converge within the above systems, a matching process takes place, together with an interaction relating to stability of visual perception.

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