Abstract
Reversible cryogenic blockade of the non-specific thalamo-cortical system in the region of the inferior thalamic peduncle produces in chronic cat preparations: 1. 1. An enhancement of short-latency, visual evoked responses in widespread cortical regions (posterior sigmoid, anterior suprasylvian, primary visual and primary auditory cortices). 2. 2. An enhancement of both visual and auditory evoked responses. 3. 3. An enhancement of the first positive peak of the optic tract-elicited cortical response and the third and fourth peaks of the optic radiation-elicited potential, implying both a greater transmission through the lateral geniculate body and a greater cortical response to a constant afferent input. These electrophysiological results are correlated with behavioral deficits in response inhibition and directed attention.
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