THALAMOCORTICAL RELATIONS AS REVEALED BY INDUCED SLOW POTENTIAL CHANGES

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Abstract
Cats have been used in a study of the steady potential changes produced at the surface of the cortex by stimulation of thalamic foci giving rise to augmenting (lateral thalamus) and recruiting (medial thalamus) responses. Stimulation of these foci at frequencies of 40-60/ second gives rise to surface-negative variations which are sustained for the duration of the stimulus and localized to the same areas from which the recruiting and augmenting responses may be evoked by low-frequency stimulation. The evidence from a variety of experiments indicates that the sustained potential changes are related to post-synaptic neuronal events in the cerebral cortex underlying the surface electrodes. These potential changes may be the result of sustained depolarization of the same elements which give rise to the surface-negative components of the low-frequency responses. The restricted localization of the high-frequency shifts suggests that both lateral and medial thalamic foci project to restricted cortical zones.

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