Abstract
We examined the auditory evoked potentials (AEP) by click stimulation in the medial geniculate body (MG) of the unanesthetized guinea pigs. The following results were obtained.
1. The AEPs were best recorded in the ventral division of MG, with the latency about 9msec. The amplitude of the AEP was larger in the medial side of MG than the lateral side. And the polarity of the AEP was positive in the caudal portion of MG, but negative in the rostral portion.
2. In the auditory evoked potentials recorded from the vertex, MG was profoundly concerned with the positive wave with the latency about 9msec, following to ABR.
3. Nembutal anesthesia decreased the amplitude of the AEP, but had little effect on the latency.
