The effect of electrostimulation of the "center of hunger" of the lateral hypothalamus and food reinforcement on the myoelectric activity of the stomach in rabbits in conditions of hunger and saturation
In the process of stimulation of the lateral hypothalamus in pre-fed animals with food in front of them, a productive food-producing behavior occurs, accompanied by the regular generation of high-amplitude slow electric waves by muscles of the lesser curvature, body and antrum of the stomach, which is reflected in the structure of the temporary organization of slow electrical activity in the form of monomodal distributions of periods slow electric waves, typical of the saturation state. Despite the increase in the level of nutritional motivation due to irritation of the lateral hypothalamus, the additional food intake in the stomach of well-fed rabbits completely eliminates the inhibitory effect of starvation motivational arousal on the slow electrical activity of the muscles of the lesser curvature, body and antrum. Changes in the slow electrical activity of the muscles of the stomach in rabbits subjected to daily food deprivation, in the presence of food in front of them and the resulting food-producing behavior in the process of electrical stimulation of the lateral hypothalamus, have a two-phase character. Despite food entering the stomach in the first phase of electrical stimulation, the downward inhibitory effect of starvation motivational stimulation on the activity of the myogenic pacemaker of the lesser curvature of the stomach eliminates the stimulating effect of food reinforcement on the slow electrical activity of the muscles of the body and the antrum. In phase II of electro-irritation, food reinforcement reduces the inhibitory effect of food motivational arousal on the activity of the myogenic pacemaker of the lesser curvature, which sets the maximum rhythm of the generation of slow electric waves to the muscles of the body and the antrum of the stomach, as indicated by the monomodal distributions of periods of slow electric waves. The results of our research indicate that the structure of the temporal organization of slow electrical activity of the muscles of the stomach reflects the convergent interactions of food motivational and reinforcing excitations on the neurons of the dorsal vaginal complex of the medulla