Korean J Otorhinolaryngol-Head Neck Surg.
2018 Nov;61(11):573-579. 10.3342/kjorl-hns.2017.00976.
The Objective Test of Cochlear Dead Region Using Acoustic Change Complex: A Preliminary Report
- Affiliations
-
- 1Department of Biomedical Engineering, University of Ulsan, Ulsan, Korea.
- 2Hearing Research Laboratory, Samsung Medical Center, Seoul, Korea. hongsh@skku.edu
- 3Department of Otorhinolaryngology-Head and Neck Surgery, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea.
- 4Department of Otorhinolaryngology-Head and Neck Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
- KMID: 2436551
- DOI: http://doi.org/10.3342/kjorl-hns.2017.00976
Abstract
- BACKGROUND AND OBJECTIVES
Cochlear dead region (CDR) is a region in the cochlear where hearing loss has occurred due to damage to the inner hair cells and/or neurons. Recently, a subjective test involving a pure-tone test in the presence of threshold-equalizing noise (TEN) was introduced to identify CDR. However, for uncooperative patients, such a subjective method would be unsuitable and objective methods would be needed instead to detect CDR. The acoustic change complex (ACC) is an evoked potential elicited by changes in the ongoing sound. In this study, we developed an objective method of identifying CDR by combining ACC response with a TEN test, namely the TEN-ACC test, and investigated its feasibility in normal-hearing listeners.
SUBJECTS AND METHOD
Ten normal-hearing subjects participated in this study. All subjects underwent both behavioral TEN test and electrophysiological TEN-ACC test. The stimuli for the TEN-ACC test consisted of TEN and embedded pure tones with different frequencies/signals to noise ratios (SNRs). To identify the thresholds, the range SNR of stimulation was varied from 0 to 20 dB, in stages of 4 dB.
RESULTS
The ACC responses of all subjects who participated in this study were well elicited by stimuli developed for the TEN-ACC test. We confirm that the pure-tones embedded in TEN elicited the objective ACC response.
CONCLUSION
The results of this study suggest that the novel TEN-ACC test can be applied to evoke ACC in normal-hearing listeners. Future research should incorporate hearing-impaired listeners to determine the feasibility of the TEN-ACC test as an objective method to identify CDR.
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