tone decay test

tone de·cay test

the sounding of a continuous tone at threshold for 1 min; if the intensity must be increased by more than 5 dB for continued perception, it is indicative of a neural hearing loss.
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tone decay test

Audiology A hearing test that evaluates defects in adaptation to sounds, formally known as auditory fatigue–tone decay, which indicates a defect in retrocochlear transmission of nerve impulses from the ear, possibly caused by pressure or 8th cranial nerve damage. See Acoustic nerve.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.