2 SOURCES OF ACOUSTIC DISTORTION PRODUCTS FROM THE HUMAN COCHLEA

The amplitude and phase of both stimulus-frequency and distortion-prod uct emissions have been measured in healthy human ears, In some ears i t is possible to model acoustic distortion products (DPs) generated by low-to-moderate stimulus levels as the vector sum of two components o riginating from distinct regions of the cochlea, one from the f(2) pla ce and the other, with a longer delay, from the distortion product pla ce. The phase lag of the more delayed DP component is slightly greater than that of stimulus frequency emissions (SFEs) measured in the same ears. (C) 1996 Acoustical Society of America.