人工耳蜗植入儿童擦音发音声学特征分析OA

OBJECTIVE To analyze the acoustic characteristics of fricatives produced by prelingually deafened Mandarin-speaking children with cochlear implants(CI)and compare them with those of children with normal hearing(NH).METHODS Participants included 30 prelingually deaf children who received unilateral cochlear implantation before the age of 3 years(CI group)and 30 NH children matched for chronological age.All children used Mandarin Chinese daily in communication and demonstrated basic speech production abilities.We selected word lists developed by Institute of Linguistics,Chinese Academy of Social Sciences.Recordings of Mandarin words with fricatives/f/,/s/,/sh/,/x/in syllable-initial position were obtained via a picture-naming task.Acoustic analysis was performed,including parameters such as fricative duration,normalized amplitude,spectral peak location,and four spectral moments(spectral centroid,variance,skewness,and kurtosis).RESULTS 1.NH children showed a significant main effect of place of articulation across all seven acoustic parameters,whereas CI children exhibited a significant main effect of place only for spectral skewness.2.Except for fricative duration,CI children differed significantly from NH children on multiple key acoustic parameters,including spectral peak location,normalized amplitude,spectral centroid,variance,skewness,and kurtosis.3.CI children demonstrated significant'Group×Place'of articulation interaction effects for spectral peak location,normalized amplitude,spectral variance,and spectral skewness.CONCLUSION CI children failed to establish clear and stable internal representations of fricative acoustic categories.Their produced fricatives exhibited compressed and overlapping acoustic spaces,revealing that both perceptual blurring and insufficient fine motor control contribute to their fricative development difficulties.