VOWEL PRODUCTION CHANGES IN FARSI-SPEAKING CHILDREN WITH PRELINGUAL DEAFNESS AFTER MULTICHANNEL COCHLEAR IMPLANTATION

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AMIR FATAHI R.; SHEYKHZADEH NAJAR H.

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Journal: AMIRKABIR Year:2001 | Volume:12 | Issue:46 Page(s): 209-227

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Title

VOWEL PRODUCTION CHANGES IN FARSI-SPEAKING CHILDREN WITH PRELINGUAL DEAFNESS AFTER MULTICHANNEL COCHLEAR IMPLANTATION

Author(s)

AMIR FATAHI R. | SHEYKHZADEH NAJAR H. | Issue Writer Certificate

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Abstract

In this research, we have studied the static features of three main Farsi vowels (/a/, i /, / u /), uttered by four prelingual Farsi-speaking cochlear implant (CI) children (7-13 years old). For this reason, we have recorded five meaningful sentences uttered by the patients before the operation and after three, six and nine months post-operation. At each session, patients read the sentences once in device-on (PN) condition and then after a 30 minutes stay, in a device-off (PF) condition. To be able to conduct a more objective study (rather than subjective evaluations conducted by other researchers), we extracted features such as fundamental frequency, the first two formants frequencies and the vowel location in the vowel triangle. In addition, we have introduced two new features called Relative Energy (RD, the ratio of the vowel energy to the energy of its preceding consonant), and Relative Duration (RD, the ratio of the vowel duration to the word, duration). We have shown that the two new features are consistent and valid for normal speakers, and thus can be employed as measures of speaker's control on vowel production, voicing and duration. Quantitative results show that :1) Almost all of the static features considered have consistently improved in time after the operation. It is particularly interesting to notice that due to the adverse quality of the uttered speech, subjective evaluations could hardly reach to a conclusion. 2) At least for the static features under study, the patient's reliance on the AF "decreased" consistently by time. While in the few first months after the operation loss of the AF could degrade the speech quality to a noticeable extent, after nine months, their dependency on the AF decreased considerably. It implies that the speech production motor patterns of the patients have been trained in time.

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APA: Copy

AMIR FATAHI, R., & SHEYKHZADEH NAJAR, H.. (2001). VOWEL PRODUCTION CHANGES IN FARSI-SPEAKING CHILDREN WITH PRELINGUAL DEAFNESS AFTER MULTICHANNEL COCHLEAR IMPLANTATION. AMIRKABIR, 12(46), 209-227. SID. https://sid.ir/paper/1112/en

Vancouver: Copy

AMIR FATAHI R., SHEYKHZADEH NAJAR H.. VOWEL PRODUCTION CHANGES IN FARSI-SPEAKING CHILDREN WITH PRELINGUAL DEAFNESS AFTER MULTICHANNEL COCHLEAR IMPLANTATION. AMIRKABIR[Internet]. 2001;12(46):209-227. Available from: https://sid.ir/paper/1112/en

IEEE: Copy

R. AMIR FATAHI, and H. SHEYKHZADEH NAJAR, “VOWEL PRODUCTION CHANGES IN FARSI-SPEAKING CHILDREN WITH PRELINGUAL DEAFNESS AFTER MULTICHANNEL COCHLEAR IMPLANTATION,” AMIRKABIR, vol. 12, no. 46, pp. 209–227, 2001, [Online]. Available: https://sid.ir/paper/1112/en

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