Power Spectral Analysis of Auditory Brain Stem Responses to Pure Tone Stimuli

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Abstract
Power spectral analysis and digital filtration of the auditory brain stem responses to tone burst stimuli were carried out in [human] adult subjects with normal hearing. Three dominant peaks (peaks A, B and C), ranging in frequency 50-150, 500-600 and 1000-1100 Hz, were observed in the spectrograms of the responses to 4 kHz at 80 dB sound level. Power of higher frequency components (peaks B and C) decreased markedly or disappeared completely with decreased markedly or disappeared completely with decreased intensity as well as decreased frequency of stimulus, while peak A .apprx. 100 Hz consistently appeared regardless of stimulus intensity of frequency. Main spectral components of the individual waves in the ABR [auditory brainstem response] were determined as follows: peak A for the slow positive deflection in the response; peak B for waves VI and VII; peak C for waves II and IV; and peaks B and C for waves I, III and V.