Abstract
The simultaneous recordings of the EEG, EMG and ECG were made in adult hens during wakefulness and hypnosis under unrestrained conditions.In an excited state, the EEG consisted of low voltage and fast waves accompanying predominant increase of the tonic EMG discharge of the neck muscles and increase of heart rates. In an unexcited state, the EEG showed high amplitude and slow waves interspersed with the arousal EEG, while the tonic EMG discharge decreased in amplitude as compared with the excited period. There was no significant heart rate difference between the excited and unexcited states.There was usually a transitional stage in the beginning of restriction within a minute. This stage was characterized by the EEG of slow waves with high amplitude and increase of the tonic EMG discharge of the neck muscles. During hypnotic state, the EEG consisted of a continuous train of slow waves of high amplitude, and the EMG decreased in amplitude. The mean heart rate during hypnotic period was lower than the means for controls, and was significantly lower than the means for the excited state at 10 minutes after immobilization in both lateral and dorsal positions.
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