Abstract
Visual evoked response (VER) to flash was averaged at the occipital cortex during paradoxical sleep (PS) in rats. The peak-to-peak amplitude with about 30 to 80 msec latency decreased as rapid eye movement (REM) rates during PS increased. Theta frequency increased with REM rates but there was no clear relationship between VER amplitude and theta frequency when no REM occurred. Further, after the medial septal lesions which abolished hippocampal theta activity, the relationship between the VER amplitude and REM rates remained while the VER amplitude, as a whole, was enhanced. Thus cortical VER may be assumed to be controlled by two inhibitory systems associated with (a) REM and (b) hippocampal theta activity. Usually they are highly related but may function independently at least in rats.
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