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RISS 인기검색어
- 검색키워드
- 저자 : Mohsen Ahadi (검색결과 2 건)
- 무료
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Brainstem Correlates of Comodulation Masking Release for Speech in Normal Hearing Adults
Soheila Rostami,Abdollah Moossavi,Mohsen Ahadi,Shohreh Jalaei 대한청각학회 2018 Journal of Audiology & Otology Vol.22 No.3
Weak signals embedded in fluctuating masker can be perceivedmore efficiently than similar signals embedded in unmodulated masker. This releasefrom masking is known as comodulation masking release (CMR). In this paper, we investigate,neural correlates of CMR in the human auditory brainstem. Subjects and Methods: Atotal of 26 normal hearing subjects aged 18-30 years participated in this study. First, theimpact of CMR was quantified by a behavioral experiment. After that, the brainstem correlatesof CMR was investigated by the auditory brainstem response to complex sounds (cABR) incomodulated (CM) and unmodulated (UM) masking conditions. Results: The auditory brainstemresponses are less susceptible to degradation in response to the speech syllable /da/ inthe CM noise masker in comparison with the UM noise masker. In the CM noise masker, frequency-following response (FFR) and fundamental frequency (F0) were correlated with betterbehavioral CMR. Furthermore, the subcortical response timing of subjects with higher CMRwas less affected by the CM noise masker, having higher stimulus-to-noise response correlationsover the FFR range. Conclusions: The results of the present study revealed a significantlink between brainstem auditory processes and CMR. The findings of the present studyshow that cABR provides objective information about the neural correlates of CMR forspeech stimulus.
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Atta Heidari,Abdollah Moossavi,Fariba Yadegari,Enayatollah Bakhshi,Mohsen Ahadi 대한청각학회 2018 Journal of Audiology & Otology Vol.22 No.3
Numerous studies have indicated deterioration of speechperception in noisy conditions among the elderly even those with normal hearing capabilities. The aim of this study was to investigate the effects of age on the speech-in-noise identificationby speech-in-noise (SIN) test, subjective ratings of hearing difficulties by speech,spatial, and qualities of hearing scale (SSQ) questionnaire and encoding of fundamental frequency(F0) by Speech auditory brainstem response (ABR) in the elderly and comparing theresults with young people. Subjects and Methods: The present study was conducted on32 elderly people aged over 60 years old (17 male and 15 female) with the mean age of68.9 (standard deviation=6.33) possessing normal peripheral hearing and 32 young subjects(16 male and 16 female) aged 18-25 years old. Results: Findings showed that thescore of SIN test is lower among the elderly people as compared with young people in signal-to-noise ratios of 0 and -10 based on Iranian version of SSQ questionnaire (p<0.001). The range of F0 amplitude in the elderly people is also lower than young people (p<0.001) inSpeech ABR. Conclusions: It seems that speech processing in older people is deterioratedcomparing with young people regardless of their normal peripheral auditory thresholds. Thisdecrease will result in weaker perception and improper segregation of speech from othercompeting sources.
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