Forward-Masking Recovery and the Assumptions of the Temporal Masking Curve Method of Inferring Cochlear Compression

被引:4
|
作者
Perez-Gonzalez, Patricia [1 ,2 ]
Johannesen, Peter T. [1 ,2 ]
Lopez-Poveda, Enrique A. [1 ,2 ,3 ]
机构
[1] Univ Salamanca, Inst Neurociencias Castilla & Leon, Salamanca 37007, Spain
[2] Inst Invest Biomed Salamanca, Grp Audiol, Salamanca, Spain
[3] Univ Salamanca, Fac Med, Dept Cirugia, Salamanca 37007, Spain
来源
TRENDS IN HEARING | 2014年 / 18卷
关键词
cochlear nonlinearity; DPOAEs; otoacoustic emissions; middle-ear muscle reflex; HEARING-IMPAIRED LISTENERS; PERIPHERAL AUDITORY COMPRESSION; INDIVIDUALIZED AUDIOMETRIC LOSS; PRODUCT OTOACOUSTIC EMISSIONS; BASILAR-MEMBRANE NONLINEARITY; HAIR CELL DYSFUNCTION; PSYCHOPHYSICAL MANIFESTATIONS; HIGH-FREQUENCIES; STIMULUS LEVEL; OFF-FREQUENCY;
D O I
10.1177/2331216514564253
中图分类号
R36 [病理学]; R76 [耳鼻咽喉科学];
学科分类号
100104 ; 100213 ;
摘要
The temporal masking curve (TMC) method is a behavioral technique for inferring human cochlear compression. The method relies on the assumptions that in the absence of compression, forward-masking recovery is independent of masker level and probe frequency. The present study aimed at testing the validity of these assumptions. Masking recovery was investigated for eight listeners with sensorineural hearing loss carefully selected to have absent or nearly absent distortion product otoacoustic emissions. It is assumed that for these listeners basilar membrane responses are linear, hence that masking recovery is independent of basilar membrane compression. TMCs for probe frequencies of 0.5, 1, 2, 4, and 6 kHz were available for these listeners from a previous study. The dataset included TMCs for masker frequencies equal to the probe frequencies plus reference TMCs measured using a high-frequency probe and a low, off-frequency masker. All of the TMCs were fitted using linear regression, and the resulting slope and intercept values were taken as indicative of masking recovery and masker level, respectively. Results for on-frequency TMCs suggest that forward-masking recovery is generally independent of probe frequency and of masker level and hence that it would be reasonable to use a reference TMC for a high-frequency probe to infer cochlear compression at lower frequencies. Results further show, however, that reference TMCs were sometimes shallower than corresponding on-frequency TMCs for identical probe frequencies, hence that compression could be overestimated in these cases. We discuss possible reasons for this result and the conditions when it might occur.
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页数:14
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