[The spectral correlation characteristics of the brain electrical activity in the rabbit during thirst].

Spectral-correlation analysis of the summate electrical activity of a number of subcortical structures of rabbit brain, having, by literature data, a relation to drinking behaviour showed that the increase of drinking excitability, induced by water deprivation was accompanied by definite reconstruction of biopotentials. In electrical activity of the studied structures, the spectrum power, as a rule, decreased (except in the paraventricular nucleus), and a definite structure of coherent connections between the subcortical and cortical potentials was established. Among the studied subcortical formations, structures (anterior hypothalamic area, lateral preoptic area, medial preoptic area, paraventricular nucleus) could be singled out where reconstructions of spectral characteristics of biopotentials took place most regularity, and the electrical processes in which were characterised by coherence index by an increase of spatial interconnection with the neocortex potentials, what allows to consider them as most significant for organization of drinking excitation.