scholarly journals Influence of primary-level and primary-frequency ratios on human distortion product otoacoustic emissions

2006 ◽  
Vol 119 (1) ◽  
pp. 418-428 ◽  
Author(s):  
Tiffany A. Johnson ◽  
Stephen T. Neely ◽  
Cassie A. Garner ◽  
Michael P. Gorga
Keyword(s):  
Otoacoustic Emissions ◽  
Distortion Product Otoacoustic Emissions ◽  
Primary Level ◽  
Distortion Product ◽  
Primary Frequency ◽  
Frequency Ratios

Detection of Hearing Loss Using 2f2-f1 and 2f1-f2 Distortion-Product Otoacoustic Emissions

2005 ◽  
Vol 48 (5) ◽  
pp. 1165-1186 ◽  
Author(s):  
Tracy S. Fitzgerald ◽  
Beth A. Prieve
Keyword(s):  
Otoacoustic Emissions ◽  
Signal To Noise Ratio ◽  
Normal Hearing ◽  
Hearing Impaired ◽  
Distortion Product Otoacoustic Emissions ◽  
Signal To Noise ◽  
Primary Level ◽  
Distortion Product ◽  
Hearing Status ◽  
Stimulus Parameters

Although many distortion-product otoacoustic emissions (DPOAEs) may be measured in the ear canal in response to 2 pure tone stimuli, the majority of clinical studies have focused exclusively on the DPOAE at the frequency 2f1-f2. This study investigated another DPOAE, 2f2-f1, in an attempt to determine the following: (a) the optimal stimulus parameters for its clinical measurement and (b) its utility in differentiating between normal-hearing and hearing-impaired ears at low-to-mid frequencies (≤2000 Hz) when measured either alone or in conjunction with the 2f1-f2 DPOAE. Two experiments were conducted. In Experiment 1, the effects of primary level, level separation, and frequency separation (f2/f1) on 2f2-f1 DPOAE level were evaluated in normal-hearing ears for low-to-mid f2 frequencies (700–2000 Hz). Moderately high-level primaries (60–70 dB SPL) presented at equal levels or with f2 slightly higher than f1 produced the highest 2f2-f1 DPOAE levels. When the f2/f1 ratio that produced the highest 2f2-f1 DPOAE levels was examined across participants, the mean optimal f2/f1 ratio across f2 frequencies and primary level separations was 1.08. In Experiment 2, the accuracy with which DPOAE level or signal-to-noise ratio identified hearing status at the f2 frequency as normal or impaired was evaluated using clinical decision analysis. The 2f2-f1 and 2f1-f2 DPOAEs were measured from both normal-hearing and hearing-impaired ears using 2 sets of stimulus parameters: (a) the traditional parameters for measuring the 2f1-f2 DPOAE (f2/f1 = 1.22; L1, L2 = 65, 55 dB SPL) and (b) the new parameters that were deemed optimal for the 2f2-f1 DPOAE in Experiment 1 (f2/f1 = 1.073, L1 and L2 = 65 dB SPL). Identification of hearing status using 2f2-f1 DPOAE level and signal-to-noise ratio was more accurate when the new stimulus parameters were used compared with the results achieved when the 2f2-f1 DPOAE was recorded using the traditional parameters. However, identification of hearing status was less accurate for the 2f2-f1 DPOAE measured using the new parameters than for the 2f1-f2 DPOAE measured using the traditional parameters. No statistically significant improvements in test performance were achieved when the information from the 2 DPOAEs was combined, either by summing the DPOAE levels or by using logistic regression analysis.

Relationship Between Distortion Product Otoacoustic Emissions and Hearing Loss

2006 ◽  
Vol 2 (1) ◽  
pp. 2-9
Author(s):  
Tiffany A. Johnson ◽  
Stephen T. Neely ◽  
Michael P. Gorga
Keyword(s):  
Hearing Loss ◽  
Otoacoustic Emissions ◽  
Distortion Product Otoacoustic Emissions ◽  
Distortion Product

Distortion product otoacoustic emissions upon ear canal pressurization

2013 ◽  
Vol 133 (4) ◽  
pp. EL331-EL337 ◽  
Author(s):  
Makram Zebian ◽  
Volker Schirkonyer ◽  
Johannes Hensel ◽  
Sven Vollbort ◽  
Thomas Fedtke ◽  
...  
Keyword(s):  
Otoacoustic Emissions ◽  
Distortion Product Otoacoustic Emissions ◽  
Ear Canal ◽  
Distortion Product

Dependence of distortion‐product otoacoustic emissions on primary levels in normal and impaired ears. II. Asymmetry in L1,L2 space

1995 ◽  
Vol 97 (4) ◽  
pp. 2359-2377 ◽  
Author(s):  
M. L. Whitehead ◽  
B. B. Stagner ◽  
M. J. McCoy ◽  
B. L. Lonsbury‐Martin ◽  
G. K. Martin
Keyword(s):  
Otoacoustic Emissions ◽  
Distortion Product Otoacoustic Emissions ◽  
Distortion Product
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