[Findings and reflections on the reverberation of thalamocortical impulses].
Chang's experiments showing the rhythmic afterdischarge in slightly nembutalized cats which he considered as a manifestation of the activity of thalamocortical reverberating circuits, prompted us to study the origin of the afterdischarge in the auditory cortex arising in response to single sound clicks on unanesthetized immobilized and nembutalized cats. The rhythmic afterdischarge was found to be most pronounced at light anesthesia with a tendency of background activity to synchronization, which may be evidenced by rare bursts of spindles. During the prolonged spontaneous desynchronization as well as during stimulation of mesencephalic reticular formation no rhythmic afterdischarge and no spontaneous bursts of spindles arose. With a deepening of anesthesia slow afterdischarge undergoes precisely the same changes as spontaneous spindle bursts (the duration tends to increase for a while with a subsequent decrease, the frequency and then the amplitude of waves decrease and eventually they disappear altogether). These and other findings suggest that rhythmic afterdischarge of the auditory cortex arising to sound clicks seems to be similar to the evoked spindle in response to peripheral and central stimulations. It was reported in many previous and recent papers. The fact, that following the cooling or ablation of the auditory cortex the rhythmic afterdischarge to sound clicks as well as spontaneous spindle bursts keep arising in the medial geniculate body without changing their patterns, militates also against the possibility of thalamocortical reverberation.
D000818:Animals; D001303:Auditory Cortex / Q000502:physiology*; D001307:Auditory Perception / Q000502:physiology*; D002415:Cats; D004594:Electrophysiology; D005829:Geniculate Bodies / Q000502:physiology*; D008636:Mesencephalon / Q000502:physiology; D009434:Neural Pathways; D012154:Reticular Formation / Q000502:physiology
Nekotorye dannye i soobrazheniia o talamokortikal'noĭ reverberatsii impul'sov