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Figure 1 : Polygraphic aspects of the two states of sleep(A) Wakefulness: Fast cortical and subcortical activity. (B) Slow sleep: Cortical and subcortical spindles and slow waves. Persistence of nuchal EMG activity (EMG). No eye movements (EYES). (C) P.S.: Fast cortical activity similar to (A). Regular alpha-activity in the ventral hippocampus (HIPP). Phasic activity in the pontine reticular formation (PRF). Complete disappearance of nuchal EMG activity and rapid eye movements. Changes in respiratory activity (RESP) and the plethysmographic index (PLETH). SMC = sensorimotor cortex; ESC = ectosylvian cortex. MRF = midbrain reticular formation. Scale: 1 sec; 50 microV From Jouvet,1962a. |