TY - JOUR
T1 - Steep and shallow phase gradient distortion product otoacoustic emissions arising basal to the primary tones
AU - Martin, Glen K.
AU - Stagner, Barden B.
AU - Fahey, Paul F.
AU - Lonsbury-Martin, Brenda L.
N1 - Funding Information:
This work was supported in part by the NIH (Grant No. DC000613) and the VA Rehabilitation, Research and Development Service (Grant Nos. C449R and C6212L). The authors thank Alisa Nelson-Miller for technical assistance and three anonymous reviewers for their insightful comments and suggestions.
PY - 2009
Y1 - 2009
N2 - Distortion product otoacoustic emission (DPOAE) level/phase maps were collected in humans with and without an interference tone (IT) near the DPOAE frequency place (fdp) at primary-tone levels of 75 dB SPL. A DPOAE component with the expected steep phase gradient could be extracted at f dp, however, considerable vertical-phase banding, presumably indicative of reflection emissions, remained. An IT placed 0.33 oct above f 2 removed most of this banding, revealing DPOAE components originating basal to the IT frequency place. These findings suggest that the commonly accepted two-source model of DPOAE generation may need to be qualified when higher primary-tone levels are utilized.
AB - Distortion product otoacoustic emission (DPOAE) level/phase maps were collected in humans with and without an interference tone (IT) near the DPOAE frequency place (fdp) at primary-tone levels of 75 dB SPL. A DPOAE component with the expected steep phase gradient could be extracted at f dp, however, considerable vertical-phase banding, presumably indicative of reflection emissions, remained. An IT placed 0.33 oct above f 2 removed most of this banding, revealing DPOAE components originating basal to the IT frequency place. These findings suggest that the commonly accepted two-source model of DPOAE generation may need to be qualified when higher primary-tone levels are utilized.
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U2 - 10.1121/1.3073734
DO - 10.1121/1.3073734
M3 - Article
C2 - 19275280
SN - 0001-4966
VL - 125
SP - EL85-EL92
JO - Journal of the Acoustical Society of America
JF - Journal of the Acoustical Society of America
IS - 3
ER -