to have a higher discomfort threshold, but the sound is just as harmful to their ears.

The acoustic reflex threshold can be decreased by the simultaneous presentation of a second tone (facilitator). The facilitator tone can be presented to either ear. This facilitation effect tends to be greater when the facilitator tone has a frequency lower than the frequency of the elicitor (i.e. the sound used to trigger the acoustic reflex).

Characteristics and effects

* For most animals, the acoustic reflex is the contraction of

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