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DPOAE Fine Structure, Suppression, and Influence on Clinical Decision-Making

Department of Speech Pathology and Audiology, Ball State University
Muncie, IN

In normal-hearing subjects, distortion product otoacoustic emissions display a distinct pattern of amplitude and phase variation when measured with high frequency resolution. This pattern, known as fine structure, is partly responsible for the wide amplitude variation see in normative data. Fine structure also complicates interpretation of clinical DP-grams and input-output functions. Use of a moderate-level suppressor tone to minimize the amplitude variation of fine structure is not clinically feasible due to the variable effects of suppressor tones on fine structure depth. This article reviews otoacoustic emission generation mechanisms, fine structure characteristics, use of suppressor tones and the influence of fine structure on clinical decision-making.