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Abstract:
A method of auditory probe evoked potentials (APEP) was
introduced to study the functions of the prefrontal cortex (PFC) in
different stages of sleep in freely moving monkeys. The recording
electrodes were implanted into the dorsal-lateral prefrontal cortex
(DLPFC) and other brain areas. The EOG was recorded as well. The
experiment started after monkey had got used the stimulating sound
(SS)(100ms in duration, 2000Hz in frequency, 70db in intensity),
while monkey was in the cage. The results showed that 1. In DLPFC,
the lowest amplitudes (AMP) of the APEP were observed in REMS and
the highest AMP was observed in awaking and quiet conditions. 2. In
vertical PFC (VPFC), the highest AMP was observed in non-REMS and
the lowest in REMS. 3. The reduction of the AMP in REMS was much
greater both in the DLPFC and VPFC than that in other cortex areas.
These great reductions of the AMP of APEP in REMS may suggest that
PFC be busy to do something in REMS. Because the REMS was believed
to be important in the information reprocessing, the PFC might be
more involved in reprocessing the information stored during daytime
than any other part of the cortex.
Supported by: Yunnan and Chinese Science Foundation, National
Basic Research Program of China.
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