[Primary dominant focus in thirst motivation].

In cats kept on the salt diet, spontaneous cortical EEG and electrohypothalamogram were recorded in stimulation of the tongue, stomach and intestine receptors with salt solutions. Longlasting bursts of hypersynchronized activity (HA) were recorded in the lateral and supraoptic nuclei of the hypothalamus, the bursts spreading over to the brain cortex in longer salt diets. The HA also were evoked with light and sound stimuli and disappeared after intracavital administration of water or after i.v. administration of saline. A primary focus of stationary excitation possessing some features of a dominanta in formation of the thirst motivation, seems to appear in the hypothalamus.