Abstract
BSR audiometry was administered to 20 normal and 44 hearing impaired subjects. The hearing impaired group consisted of 15 subjects with flat loss, 17 high tone loss and 12 low tone loss. One-and-a-half cycles of a 500Hz sinusoidal wave (500Hz click) and one cycle of a 3kHz sinusoidal wave (3kHz click) were used as stimuli. Intensities of these stimuli were calibrated by the averaged subjective threshold from 20 normal hearing ears. (dBHL)In normal subjects, the averaged threshold of the BSR evoked by a 500Hz click was 13.1dBHL and by a 3kHz click, 4.2dBHL.BSR frequency specificity was determined by measuring the BSR (to 500Hz and 3kHz clicks) in hearing impaired subjects. The 500Hz click evoked a BSR in subjects whose pure tone audiograms were impaired above 500Hz. Also, in cases of low tone hearing loss, the BSR was evoked at the best-hearing frequency above 500Hz. The 3kHz click evoked a BSR in subjects with hearing impairment above 1kHz.These results indicate that the BSR provide information regarding hearing ability as low frequency as 500Hz.
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