[Electrical activity of the brain during behavior directed at elimination of a dominant]

Abstract

The stage of dominant discontinuation (ending) was studied on the model of "polarization dominant". The dominant focus was created in rabbits at the site of forepaw projection in the cortex. On reaching the dominant optimum it was disrupted (DC was switched off) after summation (forepaw movement) in response to eye stimulation by an air puff. In the next tests the rabbit voluntarily disrupted the dominant by blinking of the corresponding eye after DC was switched on. The analysis of electrical brain activity by computer showed, that goal-directed blinking is preceded by the rise in the estimation of power spectra in the range of delta-frequencies of potentials in the neocortical frontal zones and in subcortical structures connected with blinking function. In the latter the potentials change earlier than in the cortex. Goal-directed blinking is preceded by the appearance of hemispheric asymmetry and of readiness potentials in the electrical activity of the neocortical frontal zones.