Cortical—Subcortical Relationships, Thalamocortical Connections, and Dominant Foci in the Hypothalamus
In the course of investigation of cortical—subcortical relationships in the presence of a dominant focus the question arose as to the effect of the diffuse thalamic system on an experimentally created focus of excitation in the cortex. As Pavlygina (1960) showed, additional polarization of the medial nuclei of the thalamus by a weak direct current against the background of an existing cortical dominant considerably increases the movement evoked by indifferent stimuli (Fig. 25). The same effect on a cortical dominant focus was found by Kalinin (1965) during additional polarization of the mesencephalic reticular formation by a weak direct current in rabbits. Increasing the strength of the polarizing current applied either to the medial thalamic nuclei or the mesencephalic reticular formation at first strengthens the dominant focus, but later inhibits it.
KeywordsMotor Cortex Globus Pallidus Thalamic Nucleus Acoustic Stimulation Medial Geniculate Body
Unable to display preview. Download preview PDF.