[Responses of the primary somatosensory cortex to rhythmic stimulation of the vibrissae in the cat].

Extracellular and intracellular responses of cortical neurons localized in SI cortex to repetitive mechanical stimulation of vibrissae were studied in unanesthetized immobilized cats. Spike responses of neurons to stimulation of vibrissae could reproduce somewhat higher frequencies than those in response to electrical stimulation of the infraorbital nerve. An increase in frequency of vibrissae stimulation led to a limitation of peripheral receptive fields.

[Neuronal response of the primary somatosensory cortex to paired stimulation of the infraorbital nerve and vibrissae of cats].

Extracellular and intracellular response of 128 neurons to paired stimuli applied to the infraorbital nerve and vibrissae were studied in the SI cortical zone of immobilized cats. Conditioning stimulation evoked a complete depression of responsiveness for 10-120 ms in different neurons. Duration of the complete depression of test responses depended on location of stimulated vibrissa in the peripheral receptive field of the neuron.

[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.

[Reactions of neurons of the primary somatosensory cortex in cats to stimulation of different vibrissae].

Extracellular and intracellular reactions of 57 neurons from the vibrissal projection region in SI cortical zone were studied in cats. Intensity of both excitatory and inhibitory reactions decreased when stimulation of the receptive field was shifted from the centre to the periphery. A relative role of inhibition of vibrissal stimulation in inhibition/excitation interactions increased during such shift.