A DECADE ago, the technological breakthrough of Aserinsky's, Kleitman's, and Dement's work,1-3 which made possible the systematic study of dreaming sleep, held out the promise of important new insights for psychology. The fact that mental content of two distinctive types was found to be coincident with the two phases of sleep meant an expansion in our thinking about mental life as differing in kind but continuous throughout the 24-hour sleep-wakefulness cycle. This, coupled with the ability to locate, in terms of the neurophysiological indicators of the two sleep states, when content of a particular type is likely to be taking place during sleep, seemed certain to push forward our understanding of human experience by broadening the base to include both day and night behavior. The research which followed has been devoted largely to establishing the general consistencies and correlates
Cartwright RD, Monroe LJ, Palmer C. Individual Differences in Response to REM Deprivation. Arch Gen Psychiatry. 1967;16(3):297–303. doi:10.1001/archpsyc.1967.01730210037007
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