[A coherent analysis of the neocortical electrical activity on the cessation of a thirst dominant].

During learning of an animal to goal-directed discontinuation of the thirst dominant, the stable temporary connection established between the center where the dominant focus has been created and the center related to the goal-directed blinking reaction. Study of the spatio-temporal relations of neocortical biopotentials in rabbits learned to goal-directed behaviour showed that in the motivation state of thirst induced by water deprivation the level of coherence of the electrical activity in the low-frequency range increased between the frontal cortex (the swallowing center) and the blinking cortical center. The observed changes testify to the readiness of certain structures of the dominant constellation for realization of the temporary connection. Analysis of the EEG recorded in three successive 5-sec intervals which preceded blinking revealed a certain dynamics of changes in coherent characteristics. These findings reflect a functional ambiguity and phase course of the processes which accompany preparation for a goal-directed reaction. The blinking reaction occurs at the background of increasing correlation between electrical processes in symmetrical points of the cortical blinking center in the right and left hemispheres.