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Estimates of cochlear compression using distortion product otoacoustic emissions and growth of forward masking
Travis M Moore1, Linda J Hood, Benjamin W Y Hornsby
1Department of Hearing and Speech Science, Vanderbilt University, Vanderbilt Bill Wilkerson Center, Nashville, Tennessee, USA.
Objective:
The authors investigated the relationship between behavioral and physiologic estimates of cochlear compression.
Design:
Cochlear compression was estimated in distortion product otoacoustic emission (DPOAE) fine structure minima and maxima near 4 kHz. The composite DPOAE response and separated generator and reflection components yielded three estimates in four young adults with normal hearing. DPOAE estimates were compared to behavioral compression estimates derived using a growth of forward masking (GOFM) paradigm. The DPOAE primary tone f2 and GOFM signal were identical and selected individually based on placement in a DPOAE fine structure minimum.
Results:
Across participants, DPOAE compression estimates derived from the generator component were most similar to estimates derived from the GOFM paradigm and did not vary with DPOAE fine structure.
Conclusions:
These results suggest that the generator component may provide a quick, reliable estimate of cochlear compression in humans. This may prove useful in populations that cannot give behavioral responses.
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