Abstract
This study was designed to establish an accurate and practical means for obtaining objective frequency-specific threshold of auditory brainstem response (ABR).The derived ABR presumably contributed from the cochlea tuned to octave frequency band was recorded in 16 young subjects with normal hearing and 23 patients with various types of cochlear hearing loss. A frequency-selective method was applied to yield the derived ABR, using high-pass filtered noises with five different cut-off frequencies of 0.5kHz, 1kHz, 2kHz, 4kHz and 8kHz, and with a definite cut-off slope 96dB/octave. Measurement of the derived ABR threshold could result in frequency-specific information initiated from the cochlea.The average threshold of the derived ABR for each of the octave-frequency bands was determined as representing a reference level for objective audiogram estimation with the derived ABR in the 16 young subjects with normal hearing. The derived ABR audiograms based on the reference level had good correlations to the pure-tone audiograms in cochlear hearing loss. This derived ABR technique was found promissing for the objective reconstruction of the audiogram with the derived ABR.
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