Abstract
The brain stem response (BSR) and the frequency-following response (FFR) evoked by 500 c/sec tone bursts were simultaneously recorded from the twenty normal hearing and twenty-eight hearing-impaired subjects. By reversing the stimulus phase and the polarity of the recordings, the BSR and FFR could also be recorded in isolation from one another. In normal hearing subjects the FFR could be recorded at intensities of 30 dB HL or 40 dB HL, while the BSR could be discerned at even lower stimulus levels. In cases of severe high frequency hearing loss, both the BSR and the FFR could be recorded at normally low stimulus levels which is inconsistent with the view that BSR and FFR originate from the basal turn of cochlea. In cases of flat conductive hearing loss, the discrepancies between the BSR thresholds and the FFR thresholds were in the normal range (20–30 dB), but in cases of flat sensorineural hearing loss, these discrepancies were absent or very small (within 10 dB). We attribute this to recruiting.
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