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Article
Modeling DPOAE Input/Output Function Compression: Comparisons with Hearing Thresholds
Journal of the American Academy of Audiology (2014)
  • Shaum P. Bhagat, University of Memphis
Abstract
Background: 

Basilar membrane input/output (I/O) functions in mammalian animal models are characterized by linear and compressed segments when measured near the location corresponding to the characteristic frequency. A method of studying basilar membrane compression indirectly in humans involves measuring distortion-product otoacoustic emission (DPOAE) I/O functions. Previous research has linked compression estimates from behavioral growth-of-masking functions to hearing thresholds.

Purpose: 

The aim of this study was to compare compression estimates from DPOAE I/O functions and hearing thresholds at 1 and 2 kHz.

Research Design: 

A prospective correlational research design was performed. The relationship between DPOAE I/O function compression estimates and hearing thresholds was evaluated with Pearson product-moment correlations.

Study Sample: 

Normal-hearing adults (n = 16) aged 22‐42 yr were recruited.

Data Collection and Analysis: 

DPOAE I/O functions (L 2 = 45‐70 dB SPL) and two-interval forced-choice hearing thresholds were measured in normal-hearing adults. A three-segment linear regression model applied to DPOAE I/O functions supplied estimates of compression thresholds, defined as breakpoints between linear and compressed segments and the slopes of the compressed segments. Pearson product-moment correlations between DPOAE compression estimates and hearing thresholds were evaluated.

Results: 

A high correlation between DPOAE compression thresholds and hearing thresholds was observed at 2 kHz, but not at 1 kHz. Compression slopes also correlated highly with hearing thresholds only at 2 kHz.

Conclusions: 

The derivation of cochlear compression estimates from DPOAE I/O functions provides a means to characterize basilar membrane mechanics in humans and elucidates the role of compression in tone detection in the 1‐2 kHz frequency range.
Keywords
  • Cochlea,
  • hearing,
  • otoacoustic emissions,
  • sensory thresholds
Publication Date
September, 2014
DOI
10.3766/jaaa.25.8.5
Publisher Statement
SJSU users: use the following link to login and access the article via SJSU databases.
Citation Information
Shaum P. Bhagat. "Modeling DPOAE Input/Output Function Compression: Comparisons with Hearing Thresholds" Journal of the American Academy of Audiology Vol. 25 Iss. 8 (2014) p. 746 - 759 ISSN: 2157-3107
Available at: http://works.bepress.com/shaum-bhagat/7/