Ponto-geniculo-occipital (PGO) spikes, which may be the most critical phasic event associated with REM sleep, cannot be recorded directly in humans. A partial indicator of PGO activity in humans is phasic integrated potentials (PIPs). Individuals differ in the degree to which PIPs are dispersed out of REM sleep into NREM sleep. In this study, the PIPs of 15 normal men were recorded during sleep. The following morning they were administered Rorschachs. There was a significant and positive correlation between the frequency of NREM PIPs and the number of Human Movement responses on the Rorschach, replicating the finding of an earlier study.
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