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Figure 9Triggering of the rhombencephahc phase of sleep in an intact chronic cat (V2) The horizontal line (S) signals the stimulation of the pontine reticular formation (300/sec.,1 millisecond, 0-80 volt, bipolar) for 11 seconds during the slow phase of sleep. Note the appearance of fast activity at the cortical and reticular level, the total disappearance of the EMG activity of the neck muscles (E.M.G.), the acceleration and irregularity of the respiration (RESP.), and the appearance of rapid eye movements (O). This period of sleep lasted for 10 minutes. The same phenomenon was reproduced five times in this recording session The two recordings I and II are continuous. C.S.M.; C.A.: sensory motor cortex; acoustic cortex. F.R.: mesencephalic reticular formation. Scale: 2 seconds, 50 microvolts. Note the utility of polygraphic recording without which the fast cortical activity might be interpreted as an "arousal". |