The hypothesis is proposed that POSTS of human subjects might indicate that some form of “playback” of information takes place during NREM sleep in cortical areas related to vision. Striking similarities existed between these potentials and the lambda waves (LWs) occurring in waking subjects intent at visually exploring an illuminated patterned field.
On the contrary, they were absent or very rare during REM sleep. POSTS were numerous during all stages of NREM sleep and occurred more frequently during stages 2 and 3 than 1 and 4. These individuals displayed prominent physiologic “positive occipital sharp transients of sleep” (POSTS) which were visually counted and related to the nocturnal sleep cycle. Overnight polygraphic recordings were performed on 6 subjects who had normal diurnal waking and sleep EEGs and no significant findings on neurological examination.
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