Auditory brain stem potentials in monkey (M. mulatta) and man.

Auditory brain stem potentials were mapped over the head of the rhesus monkey following monaural clicks. Latency and amplitude were dependent upon the recording site. No electrically indifferent point could be found on the head or neck. The results are interpreted as showing that waves I and V originate from single generators, whereas waves, II, III and IV originate from bilateral structures. Latency varied in a linear fashion with changes in intensity and click rate. In contrast there were variations in amplitude of the potentials independent of stimulus change. A comparison was made of auditory brain stem potentials in man, monkey, cat and rat to demonstrate the similarity of the responses across species.