[A spectral-correlational analysis of the electrical activity of the rabbit brain during the extinction of an endogenous food conditioned reflex].

Spectral analysis of electrical activity showed that at the end of extinction of the alimentary conditioned responses, elaborated on the basis of the hunger dominant, the spectral density of electrical activity of the cortical centre of the goal-directed reaction (blinking) of the trained eye and that of the lateral preoptic area, lateral hypothalamus, and ventromedial hypothalamus raised in the delta-band. To the end of the extinction the coherence (Cog) of biopotentials of the cortical centres of blinking of both eyes and electrical activity of the ventro-medial hypothalamus and medial preoptic area was changed in different directions. After the extinction of the goal-directed reaction Cog between biopotentials of the lateral hypothalamus and the electrical activity of the frontal cortex raised in the delta-band and Cog between the activity of the lateral hypothalamus and that of the cortical centres of blinking of both eyes lowered. The level of excitation of the structures included in the dominant constellation was suggested to raise to the end of the extinction of the endogenous conditioned response.