ABSTRACT
The activation–synthesis hypothesis (ASH; Hobson & McCarley, 1977) of dreaming was designed to provide an account of the psychophysiology of the most typical form of REM-sleep mentation. Because the physiological model of reciprocal interaction (1975), upon which this particular psychophysiological account was based, is relevant to all states of the brain, it seems reasonable to begin to extend the theory to an account of mentation in other states, especially that associated with NREM sleep and waking.
