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Audiology and Speech Research > Volume 12(Suppl 1); 2016 > Article
Audiology and Speech Research 2016;12(0): S21-S23.
Published online: March 31, 2016.
doi: http://dx.doi.org/10.21848/asr.2016.12.S1.S21
역치상 청각 기능 장애에 관한 최신 지견
아이오와주립대학교 의사소통장애학과
Recent Studies on Supra-Threshold Auditory Processing Deficits
Inyong Choi
Department of Communication Sciences and Disorders, University of Iowa, Iowa, IA, USA
Correspondence  Inyong Choi ,Tel: +1-319-335-8725, Fax: +1-515-294-4111, Email: inyong-choi@uiowa.edu
Received: February 28, 2016;  Accepted: March 10, 2016.  Published online: March 31, 2016.
Many normal-hearing listeners, as well as the majority of hearing impaired listeners, complain of the difficulties associated with communicating in social settings. In clinics, we see marked individual differences in speech-in-noise understanding that are not predicted by individuals’ hearing thresholds. We consider the listeners who show consistently poor performance in the speech intelligibility and/or speech-in-noise tasks, even without elevated hearing thresholds. “Central auditory processing disorder (CAPD)” has been used as an umbrella term that indicates such supra-threshold hearing problems. However, we still do not know which “central” mechanisms contribute to such problems with auditory processing. This review will introduce recent studies that substantially enhanced our understanding on neurological substrates of such central auditory processing deficits. Those studies revealed two common sources of the central hearing deficits, neither of which is closely related to hearing threshold in normal-hearing listeners: 1) differences in the fidelity of subcortical encoding of supra-threshold sound, and 2) differences in the efficacy of top-down executive control in directing selective attention. Behavioral and neuroimaging studies in both categories will be introduced. The reviewed studies would define key systems and mechanisms for central auditory processing for communications in noisy environments and neuroimaging correlates of their disorders.
Key Words: Supra-threshold auditory processing, Cochlear neuropathy, Sensory gain control, Functional neuroimaging.
중심단어: 역치상 청각 기능 장애· 와우각 신경병질· 감각 이득조절· 기능적 신경 영상.
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