Ak. Malikova, COHERENT ANALYSIS OF NEOCORTICAL ELECTRIC AL-ACTIVITY AT DISCONTINUATION OF THIRST DOMINANT, Zurnal vyssej nervnoj deatelnosti im. I.P. Pavlova, 46(6), 1996, pp. 1059-1067
During learning of an animal to goal-directed discontinuation of the t
hirst dominant, the stable temporary connection established between th
e center where the dominant focus has been created and the center rela
ted to the goal-directed blinking reaction. Study of the spatio-tempor
al relations of neocortical biopotentials in rabbits learned to goal-d
irected behaviour showed that in the motivation state of thirst induce
d by water deprivation the level of coherence of the electrical activi
ty in the low-frequency range increased between the frontal cortex (th
e swallowing center) and the blinking cortical center. The observed ch
anges testify to the readiness of certain structures of the dominant c
onstellation for realization of the temporary connection. Analysis of
the EEG recorded in three successive 5-sec intervals which preceded bl
inking revealed a certain dynamics of changes in coherent characterist
ics. These findings reflect a functional ambiguity and phase course of
the processes which accompany preparation for a goal-directed reactio
n. The blinking reaction occurs at the background of increasing correl
ation between electrical processes in symmetrical points of the cortic
al blinking center in the right and left hemispheres.