J Audiol Otol.  2017 Apr;21(1):1-8. 10.7874/jao.2017.21.1.1.

Role of Active Listening and Listening Effort on Contralateral Suppression of Transient Evoked Otoacousic Emissions

Affiliations
  • 1Department of Audiology and Speech Language Pathology, Kasturba Medical College, Manipal University, Mangalore, India. mohan.kumark@manipal.edu

Abstract

BACKGROUND AND OBJECTIVES
The present study aimed to investigate the effect of active listening and listening effort on the contralateral suppression of transient evoked otoacoustic emissions (CSTEOAEs).
SUBJECTS AND METHODS
Twenty eight young adults participated in the study. Transient evoked otoacoustic emissions (TEOAEs) were recorded using "˜linear' clicks at 60 dB peSPL, in three contralateral noise conditions. In condition 1, TEOAEs were obtained in the presence of white noise in the contralateral ear. While, in condition 2, speech was embedded into white noise at +3, −3, and −9 dB signal-to-noise ratio (SNR) and delivered to the contralateral ear. The SNR was varied to investigate the effect of listening effort on the CSTEOAE. In condition 3, speech was played backwards and embedded into white noise at −3 dB SNR. The conditions 1 and 3 served as passive listening condition and the condition 2 served as active listening condition. In active listening condition, the participants categorized the words in to two groups (e.g., animal and vehicle).
RESULTS
CSTEOAE was found to be largest in the presence of white noise, and the amount of CSTEOAE was not significantly different between active and passive listening conditions (condition 2 and 3). Listening effort had an effect on the CSTEOAE, the amount of suppression increased with listening effort, when SNR was decreased from +3 dB to −3 dB. However, when the SNR was further reduced to −9 dB, there was no further increase in the amount of CSTEOAE, instead there was a reduction in the amount of suppression.
CONCLUSIONS
The findings of the present study show that listening effort might affect CSTEOAE.

Keyword

OAE; Active listening; TEOAE suppression; Listening effort

MeSH Terms

Animals
Ear
Humans
Noise
Signal-To-Noise Ratio
Young Adult
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