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Audiol > Volume 3(1); 2007 > Article
Audiology 2007;3(1): 36-42.
Published online: June 30, 2007.
doi: http://doi.org/10.21848/audiol.2007.3.1.36
동측, 대측 배경소음이 노인의 Gap Detection에 미치는 영향
옥수진1, 임덕환2
1관동의대 명지병원 이비인후과, 한림대학교 보건대학원 청각학전공
2한림대학교 언어청각학부 청각학과, 청각언어연구소
The Effects of Ipsilateral and Contralateral Background Noises on Gap Detection Thresholds in the Elder
Soo-Jin Ok1, Dukhwan Lim2
1Department of Otolaryngology, Kwandong University College of Medicine Myongji Hospital, Seoul, Graduate Program in Audiology, Hallym University, Chuncheon, Korea
2Section of Audiology and Audiology & Speech Pathology Research Institude, Hallym University, Chuncheon, Korea
Correspondence  Dukhwan Lim ,Tel: (033) 248-2217, Fax: (033) 6280-9133, Email: dlim@hallym.ac.kr
Received: February 15, 2007;  Accepted: March 29, 2007.  Published online: June 30, 2007.
Temporal resolution has often been studied using gap detection paradigms. The smallest detectable silent interval was defined as gap detection threshold (GDT). The speech understanding of the elder generally poorer, especially under background noise conditions, regardless of their hearing loss, than that of normal adults. The purpose of this study was to investigate the effects of ipsilateral/contralateral background noises on temporal resolution in three subject groups of listeners: young adult group with normal hearing sensitivity (YNH, ages 20-29), young adult group with impaired hearing sensitivity (YIH, ages 20-29), and elderly group with impaired hearing sensitivity (OIH, ages 65-79). In this within-channel gap detection, white noise with 30 dB SL was presented monotically while speech noise was delivered to either ipsilateral or contralateral sides as a masker with various levels of SNR such as +10, 0 and -10 dB. In this result, YIH and OIH groups showed statistically significant poorer performances under no background noise presentation than YNH group (p<0.05) while YIH and OIH groups exhibited no statistically significant differences (p>0.05). Thus, the high degrees of hearing loss resulted in prolonged GDTs. YNH group showed prolonged GDTs at ipsilateral background noise level of -10 dB SNR. YIH group exhibited prolonged GDTs at ipsilateral background noise level of 0 and -10 dB SNR. Notably, OIH group demonstrated even poorer GDTs at contralateral background noise level of -10 dB SNR and at ipsilateral background noise level of +10, 0, and -10 dB SNR (p<0.05). In general, reduced SNR levels under ipsilateral noise conditions resulted in more deteriorated GDTs than those under contralateral noise conditions in all three groups. In contrast, the elder group had more difficulty in gap detection performances than the other two groups. The overall outcomes showed that the GDT data could be reliable indicators of evaluating auditory temporal performances and could also be used as effective tools for auditory rehabilitation programs in the elder.
Key Words: Gap detection threshold·Ipsilateral background noises·Contralateral background noises.
중심단어: Gap detection threshold· 동측 소음· 대측 소음.
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