1996 Volume 39 Issue 2 Pages 137-144
Binaural interaction (BI), a characteristic of the auditory system, was experimentally demonstrated using guinea pigs. Auditory brainstem response (ABR) and BI were recorded under general anesthesia. After removingthe cranial bones and inserting an electrode directly into the inferior colliculus, BI and potentials were measured. Because ABRs beyond P 3 showed differences in amplitude and phase between binaurally stimulating and summation waves, the results confirmed that the central nervous system above the superior olivary complex is related to BI. Potentials showed larger amplitudes and shorter latencies on the side opposite to the electrode insertion. This suggests that the potentials of the inferior colliculus havecontralateral dominance. Both wave latencies of ABR and BI from the potentials of the inferior colliculus correlated negatively with stimulating sound pressures
