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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
대한이비인후과학회 대한이비인후-두경부외과학회지 대한이비인후과학회지 두경부외과학 제62권 제7호
발행연도
2019.1
수록면
385 - 394 (10page)

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Background and Objectives Cochlear implant (CI) changes the way that sound inputs areprocessed in the brain, possibly causing brain reorganization. Given that the pattern and degreeof reorganization are known to be related to speech perception skill, information regardinghemispheric asymmetry can be used to predict behavioral performances in CI users. Thecurrent study investigated the hemispheric asymmetry of N1 dipole cortical activity in responseto the temporally varied speech sounds and its relationship to speech perception abilitiesin adult CI users. Subjects and Method The cortical activity was recorded from 64 scalp electrodes in 10 CIusers and 11 normal-hearing controls. Speech stimuli were synthesized consonant-vowels, the/ba/-/pa/ continuum that ranged from 0 to 50 ms with a 6-step voice onset time (VOT). N1 dipoleamplitudes, latencies, and locations were analyzed as a function of VOT and the directionof implantation. Also investigated was the relationship between N1 dipole lateralization andspeech perception. Results For the N1 dipole location, significant location differences between CI and normalhearing groups were seen at 40 ms VOT in the anterior-posterior direction. For hemisphericasymmetry, the N1 dipole activity in good CI performers was higher in the auditory cortexcontralateral to the stimulated ear, while poor CI performers showed greater ipsilateral activity. In addition, a lateralization index at 20 ms VOT showed significant correlation with the /ba/-/pa/ consonant perception scores in noise. Conclusion The results suggest that the hemispheric asymmetry of N1 dipole activity in responseto stimuli of temporally varied speech has a substantial clinical value, and that this canbe used to estimate CI speech perception.

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