A PSYCHOPHYSIOLOGICAL STUDY OF THE DEPTH OF SLEEP

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Relationships were studied between 6 EEG stages of sleep (I through V, and SA or "activated" sleep) and behavioral indices (reaction time to an auditory stimulus, and motor and verbal response to a varying number of light flashes) during human natural sleep. Results showed that the depth of sleep as expressed by reaction time and perception (cognition) of the varying number of flashes was a monotonic function of the order of the EEG sleep stages from I through V. Adaptation factor seemed to be negligible. Reaction time was the most sensitive measure of simple sleep depth among the behavioral measures used in the present study. Stage SA lied between stages V and IV or III in these measures. However, in case of incorrect or no motor response to flashes, <I>S</I> could correctly verbalize the number of the flashes more often during stage SA than during any other stages. The finding was interpreted in terms of the "dissociation" between motor and cognitive responses during this stage. EEG reactivities to the auditory and visual stimulations, and their relations to the behavioral measures were also discussed.
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