1976 Volume 19 Issue 3 Pages 187-192
Two kinds of auditory responses in the guinea pig were simultaneously recorded to study their relations, i.e., the auditory brain stem response (BSR) and the cochlear responses (CM and AP) to click stimuli. The components of BSR, CM, and AP were compared as to their latencies and input-output relations as a function of stimulus intensity. The initial deflection of BSR was identified as CM from their close correlation. The basal turn of the cochlea most likely contributes to CM of BSR. This wave was followed by four distinctive neural components labeled P1, P2, P3 and P4 within 5 msec after stimulation The peak latencies of P1 and P2 did not coincide with those of N1 and N2 components of AP. The start of N1, however, coincided with that of P1 When the stimulus increased in strength, latencies of P1 and P2 were shortened in parallel to those of N1 and N2. As propagating along the auditory nerve, the components of AP would contribute respectively to P1 and P2. The peak latencies of P3 and P4 were 2.0 to 2.5 msec and 3.0 to 3.5 msec, respectively. These value were shorter than those in the cat.