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The vocalization-induced stapedius reflex can indeed be used for hearing protection purposes. Just before an impulse noise (door slam, electromagnet lock slapback, gun shot, pound of hammer on nail) one could vocalize (or cough or hum) to protect one's hearing from the sound pressure that the impending sound would create. The reflex is not a perceptual reduction in sound; the reflex is a real reduction in sound level reaching the inner ear — an actual reduction in how far one's delicate hair cells will be bent by that sound. An identical hammer blow when one engaged in no vocalization is more damaging to one's hearing than that same hammer blow if one began vocalizing just a few tens of milliseconds prior to the blow.