[Mosaicism of excitatory and inhibitory processes in populations of cortical neurons during the brain activation response]. / Mozaichnost' vozbuditel'nykh i tormoznykh protsessov v populiatsiiakh neironov kory pri reaktsii aktivatsii mozga.

Comparative analysis of multiunit arousal response in the somatosensory I and the parietal associative brain areas of unanesthetized cats revealed the initial excitation of neuronal populations in both cortical areas to be independent of stimulus modality. The greatest firing rate was observed in the 1st period of the arousal response when the brain activation was maximal. Subsequent development of the multiunit response may be either tonic or phasic. The phasic responses are predominant in the somato-sensory neuronal populations (56-87%). The multiunit tonic responses (55-85%) occur mostly in the parietal associative area. The end of the inhibition phase coincided with the end of the arousal response. The relation of the response types to unspecific brain activation, is discussed.