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J Audiol Otol > Epub ahead of print
DOI: https://doi.org/10.7874/jao.2019.00143    [Epub ahead of print] Published online July 9, 2019.
Speech Perception and Gap Detection Performance of Single-Sided Deafness under Noisy Conditions
Chanbeom Kwak1,2  , Saea Kim1,2  , Jihyeon Lee3  , Youngjoon Seo3  , Taehoon Kong3  , Woojae Han1,2,4 
1Laboratory of Hearing and Technology, College of Natural Sciences, Hallym University, Chuncheon, Korea
2Division of Speech Pathology and Audiology, College of Natural Sciences, Hallym University, Chuncheon, Korea
3Department of Otorhinolaryngology-Head and Neck Surgery, Yonsei University Wonju College of Medicine, Wonju, Korea
4Research Institute of Audiology and Speech Pathology, College of Natural Sciences, Hallym University, Chuncheon, Korea
Correspondence  Woojae Han ,Tel: +82-33-248-2216, Fax: +82-33-256-3420, Email: woojaehan@hallym.ac.kr
Submitted: April 16, 2019  Accepted after revision: May 20, 2019
Background and Objectives
Many studies have reported no benefit of sound localization, but improved speech understanding in noise after treating patients with single-sided deafness (SSD). Furthermore, their performances provided a large individual difference. The present study aimed to measure the ability of speech perception and gap detection in noise for the SSD patients to better understand their hearing nature.
Subjects and Methods
Nine SSD patients with different onset and period of hearing deprivation and 20 young adults with normal hearing and simulated conductive hearing loss as the control groups conducted speech perception in noise (SPIN) and Gap-In-Noise (GIN) tests. The SPIN test asked how many presented sentences were understood at the +5 and -5 dB signal-to-noise ratio. The GIN test was asked to find the shortest gap in white noise with different lengths in the gap.
Compared to the groups with normal hearing and simulated instant hearing loss, the SSD group showed much poor performance in both SPIN and GIN tests while supporting central auditory plasticity of the SSD patients. Rather than a longer period of deafness, the large individual variance indicated that the congenital SSD patients showed better performance than the acquired SSD patients in two measurements.
The results suggested that comprehensive assessments should be implemented before any treatment of the SSD patient considering their onset time and etiology, although these findings need to be generalized with a large sample size.
Keywords: Single-sided deafness · Simulated conducted hearing loss · Speech perception in noise · Gap-In-Noise
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