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Figure 5 : Slow sleep and paradoxical sleep in the hen
(1) Wakefulness: fast activity in the hyperstriatum (EEG). (2) Slow sleep: slow, high-voltage activity in the hyperstriatum. No true spindles. (3) Paradoxical sleep (lasting 8 sec): considerable reduction, but not complete disappearance, of nuchal EMG activity; fast, low-voltage cerebral activity; note the burst of eye movements (EM). Bradycardia is also present. Scale: 1 sec; 50 microV. From Klein et al., 1964. |