[Inhibition in the senso-motor cortex of cats].

The responses of 340 neurons of the sensory-motor cortex to electrocutaneous stimulation of the extremities were studied in 3-30 days old kittens. Extracellular recording of 9.4% cells in 3-10 day old animals and 17.1% cells in 21-30 days old animals showed a silent period following the excitatory component of the response. Intracellular and quasi-intracellular recording revealed the presence of postsynaptic inhibition during this period. As a rule the IPSPs which followed the initial excitatory component were 250-380 ms long, being considerably longer than similar IPSPs in the sensory-motor cortex of adult cats. IPSP amplitude usually did not exceed 5 mV.