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both middle ear muscles: the stapedius and tensor tympani muscles. However, in humans, the acoustic reflex only involves the contraction of the stapedius muscle, not the tensor tympani.
* The contraction of the stapedius muscle occurs bilaterally in normal ears, no matter which ear was exposed to the loud sound stimulation.
* The prevalence of bilateral acoustic reflexes in persons 18-30 years old is 85.3% (82.9%, 87.4%) 95th percentile confidence interval N = 3280 and in all persons 74.6% (73.2%, 75.9%) N = 15,106.
* The acoustic

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