Abstract
The reflex contraction of the middle-ear muscles in response to acoustic stimuli, known as the acoustic reflex (AR), attenuates sounds below 2000Hz by up to 20dB. This is believed to protect against noise-induced hearing loss, and in experimental studies has been shown to modify the amount of temporary threshold shift (TTS) following noise exposure. The effectiveness of the protection is limited with steady-state noises however, by the adaptation of the reflex that occurs within a few minutes.
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