聴性脳幹反応(ABR)における両耳刺激効果

概要

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Binaural interaction in auditory brainstem responses (ABR) was studied in 11 normal-hearing adult subjects. Binaurally stimulating experiments in the ABR-recording from the subjects were composed of clicks at 90dBHL presented to one ear for evoking ABR and a continuous white noise at 40dB, 80dB or at silent control presented simultaneously to the contralateral ear. This method was designed to detect an alteration of the click-evoked ABR through an interference or desynchronization effect of the noise presented to the contralateral ear at a level of the brainstem where the binaural interaction took place. Among the results were the following: 1) Latencies of waves I, III, V and VI, and peak-to-peak amplitudes of waves I and III did not change with the level of the white noise presented to the contralateral ear, but the amplitudes of both waves V and VI changed significantly (p<0.01). 2) Peak-to-peak amplitudes for both waves V and VI were reduced by 22% and 50% in voltage when the level of the white noise to the contralateral ear was raised from 40dB to 80dB, respectively. These results suggest that the neural organization of the binaural interaction takes places at the level where waves V and VI are generated.
耳鼻咽喉科臨床学会の論文