Three Ss in sensory deprivation were continuously monitored by electroencephalographic (EEG) and electrooculographic (EOG) recordings. Retrospective reports of their mental states were given upon receipt of a signal. Ratings of report contents were compared with EEG determined levels of arousal and with the occurrence of rapid eye movements (REMs). Results indicate that the incidences of hallucinations and thought disorganization vary inversely with level of arousal, and hallucinations are not accompanied by REMs as occurs during dreaming.
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