抄録
Power spectral analysis and digital filtration of the auditory brain stem responses to pure-tone stimuli at the frequencies from 0.5 to 4kHz were performed in three adult subjects with normal hearing. Three dominant peaks ranging in frequency 50-150Hz (peak I), 500-600Hz (peak II) and 1000-1100Hz (peak III) were observed in the spectrograms of the responses to 4kHz at 80dB SL. Powers of peaks II and III were markedly decreased or completely disappeared with decreased intensity as well as decreased frequency of stimulus, while peak I around 100Hz was consistently appeared. Main spectral components of the individual waves in the responses were revealed as follows: peaks II and III for waves I, III and V, peak III for waves II and IV, peak II for waves VI and VII, and peak I for the slow positive deflection in the responses.
