Electrical activity was recorded from chronically implanted electrodes in the smooth muscle layers of the gastro-intestinal tract. It was analysed for a long time (8 months) in relation to food intake and dark-light schedule. Two major patterns of electrical activity were identified in the intestine. The first consisted of spike bursts that propagated aborally from the stomach or orally from the ileum. Aborad propagation was induced by the stomach and orad propagation induced an inhibitory effect on the stomach. The second pattern was aborally propagated periods of repetitive spike bursts. As they occurred, there was a reduction or a cessation of gastric spiking activity.