“The current study proposes a new, tighter measure of these hallucinatory states: Sleep onset, REM sleep, and non-REM sleep are shown to differ with regard to (a) motor imagery indicating interactions with a rich imaginative world, and (b) cognitive agency that could enable sleepers to recognize their hallucinatory state.”
“The present results support earlier physiological and psychological evidence in revealing a decline in cognitive functions and an increase in simulated interactions with a hallucinatory world, en route to normal REM sleep.”
– Clemens Speth, Jana Speth, Cognitive Science 2017 June 6 – https://www.readbyqxmd.com/read/28585737/a-new-measure-of-hallucinatory-states-and-a-discussion-of-rem-sleep-dreaming-as-a-virtual-laboratory-for-the-rehearsal-of-embodied-cognition