This test checks to see whether a reflex contraction can be maintained during a short stimulation. A continuous tone is presented for 10 seconds, which is 10dB beyond the acoustic reflex threshold. The results of the muscle response are recorded.
If the magnitude of the reflex response stays contracted for the 10 second duration, the test is negative for reflex decay. However, if the reflex response drops more than 50% during that time, the test is positive for reflex decay.