Coherence analysis of the electrical activity of the rabbit brain in the presence of a hunger dominant.

A hunger dominant was created in rabbits deprived of food for 24 hours. The presence of summations was judged on the basis of the appearance in the response to sound of swallowing or chewing movements. When a hunger dominant is created, the coherence (Coh) of the electrical activity of the frontal, sensorimotor, and parietal areas of the cerebral cortex increases, especially in the range of the delta and theta frequencies. Variously directed coherence of the potentials of the lateral (LH), middle (VmH) hypothalamus and the cortex is established, the Coh of the potentials of the LH and cortex decreases, and of the VmH and the cortex, by contrast, increases. A definite mosaic of the coherence connections of the electrical processes of the hypothalamus appears; the Coh of the potentials of the LH and VmH increases, and the Coh between the potentials of the medial and lateral preoptic areas decreases.