[Excitation and inhibition in parietal associative cortex neurons during stimulation of thalamic associative nuclei].

Responses of the parietal association cortex neurons to stimulation of lateralis dorsalis (LD) and lateralis posterior (LP) thalamic nuclei were investigated. Primary IPSP were observed in 62.5% of cases after stimulation of LD and in 79.6% of cases after LP stimulation. Latent periods of EPSP and IPSP were longer in case of LD stimulation rather than after LP stimulation. EPSP amplitude to association nuclei stimulation increased and decreased gradually, while amplitude of IPSP increased quickly and decreased slowly. Amplitude of EPSP which has appeared during IPSP development was larger than in case of the resting potential. Amplitude and duration of EPSP of the certain neuron after stimulation of different nuclei were rather similar. It is supposed that with stimulation of different association nuclei the same cortical inhibitory interneurons are involved. IPSP duration is shorter as compared to inhibition of the background impulse activity. A supposition is advanced that such a difference in duration is determined primarily by properties of these neurons.