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Habituation of postsynaptic unit responses of the cat motor cortex to stimuli of different modalities

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Habituation (extinction) of postsynaptic unit responses of the cat motor cortex to repetitive electrodermal, photic, acoustic, and combined bimodal stimulation was investigated by intracellular recording. Habituation was shown by a decrease in the number of spikes per grouped discharge and a decrease in the amplitude and duration of the EPSPs, and sometimes IPSPs, on repetition of the stimulus. The way in which the course of habituation depends on the modality and duration of stimulation (at a constant frequency of 1/sec) is examined. Habituation of postsynaptic responses to sensory stimuli is observed with neurons of different functional groups, namely identified neurons of pyramidal tract and unidentified neurons, some of which were evidently pyramidal neurons and interneurons. The hypothesis is put forward that the habituation of PSPs of the cortical neurons is based on processes taking place mainly at the subcortical level.

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Additional information

A. A. Zhdanov Leningrad State University. Translated from Neirofiziologiya, Vol. 4, No. 5, pp. 545–553, September–October, 1972.

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Pirogov, A.A., Lenkov, D.N. Habituation of postsynaptic unit responses of the cat motor cortex to stimuli of different modalities. Neurophysiology 4, 421–427 (1972). https://doi.org/10.1007/BF01063015

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  • Motor Cortex
  • Cortical Neuron
  • Pyramidal Neuron
  • Pyramidal Tract
  • Sensory Stimulus