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Acoustic reflex amplitude and noise-induced hearing loss.

Acoustic reflex maximum amplitude measurements elicited both contralaterally and ipsilaterally were obtained from subjects with  noise-induced hearing loss and compared with those obtained from normal hearing subjects. The eliciting signal was a pure tone of 1 kHz presented for 1000 ms. The groups were matched on age, sex, static immitance and ear canal volume.

Acoustic reflex amplitudes were clearly reduced in noise-impaired subjects compared with  normal-hearing subjects at a frequency where their hearing thresholds were normal.