Acoustic responses in the hypothalamus

摘要: Abstract Evoked potentials and single cell responses were recorded in the hypothalamus of cats following acoustic stimulation. Short latency evoked observed medial particularly postero-medial hypothalamus. The early component these followed high frequency stimulation, showed post-tetanic potentiation was resistant to pentobarbital anaesthesia anoxia. These properties suggested existence oligosynaptic projections recovery cycles prolongation. interaction sciatic posterior demonstrated that a conditioning stimulus had more prolonged inhibitory effect on test response than vice versa . Conditioning stimuli applied midbrain reticular formation dorsal hippocampus an Single recordings large number responsive units, majority showing increase rate firing A 50 100 msec preceding caused considerable inhibition firing, while recovered almost completely when preceded at interval by stimulus. Stimuli facilitated spontaneous activity cells but inhibited response, whereas both. possible pathways involved propagation are reviewed factors modifying sensory input discussed.