title: Discrimination of early sleep stages: behavioral indicators.
abstract: Six subjects participated in a one-night sleep-onset experiment. They were aroused from stage 1 and stage 2 as defined by standard electroencephalographic criteria. Subjects pressed a button upon arousal to indicate which of two subjective states they were in just before awakening. Performance accuracy from stage 1 awakenings appeared to remain relatively constant at approximately 83%; performance from stage 2 awakenings showed increasing accuracy. Response latencies increased between stage 1 and stage 2 awakenings.
mesh_terms: D000328:Adult; D001143:Arousal; D004569:Electroencephalography; D005071:Evoked Potentials; D005260:Female; D006801:Humans; D008297:Male; D012894:Sleep Stages; D014851:Wakefulness