[Effect of changes in the strength and frequency of stimulation of the infraorbital nerve on neuronal activity in the primary somatosensory region of the cat cerebral cortex].

Neuronal activity in the SI cortical area (vibrissae projection zone) was recorded in acute unanesthetized cats during electrical stimulation of infraorbital nerve with different intensity and frequency. Substantial changes in response patterns were found in many neurons when intensity of stimulation was increased to 5 fold threshold. Most neurons of the studied area were able to reproduce stimulation frequency not more than 20-30 per s. During rhythmic stimulation the initial inhibitory phase of response in some neurons changes to excitatory one, in others the response pattern remains unchangeable.