the reduction in intensity, at one ear, of an acoustic stimulus presented to the other ear canal as the sound is transmitted through the head; for air conduction, the reduction approximates 35 dB, but for bone conduction, it is 10 dB or less.

What is interaural attenuation?

The reduction in the intensity of the test signal as it crosses the skull is called the interaural attenuation, or interaural or transcranial transmission loss. Several workers have measured the magnitude of the interaural attenuation for various transducers for air and bone conduction audiometry.

How do you calculate interaural attenuation?

IAA was calculated by subtracting the frequency-specific ABR threshold obtained from the normal ear from that obtained following tone presentation to the 'dead' ear, and was found to average 65.0 +/- 10.5 dB at 2 kHz, 45.0 +/- 8.4 dB at 10 kHz, and 47 +/- 15.1 dB at 40 kHz (+/- standard deviation).