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OAEs are considered to be related to the amplification function of the cochlea. In the absence of external stimulation, the activity of the cochlear amplifier increases, leading to the production of sound. Several lines of evidence suggest that, in mammals, outer hair cells are the elements that enhance cochlear sensitivity and frequency selectivity and hence act as the energy sources for amplification. One theory is that they act to increase the discriminability of signal variations in continuous noise by lowering the masking effect of its cochlear amplification.[4]
The evoked responses from these stimuli occur at frequencies ( {\displaystyle f_{dp}} ) mathematically related to the primary frequencies, with the two most prominent being {\displaystyle f_{dp}=2f_{1}-f_{2}} (the "cubic" distortion tone, most commonly used for hearing screening) and {\displaystyle f_{dp}=f_{2}-f_{1}} (the "quadratic" distortion tone, or simple difference tone).[6][7]
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