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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.