Abstract
Brain stimulation classified behaviorally as rewarding or aversive was observed to have different effects on photic cortical evoked potentials in rats. Following a rewarding brain stimulation the early cortical response is attenuated and remains so for at least 25–30 sec; its recovery function is flat to 25–30 sec. Following an aversive stimulation, the response is severely attenuated for 5–6 sec but then recovers and overshoots control levels 15 sec following brain stimulation and thereafter.
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