Gökçe AKSOY, Abdullah DALGIÇ, Tolga KANDOĞAN, Levent OLGUN

Koklear implantl> çocuklarda sesin artikülasyon özelliklerinin de¤erlendirilmesi

Koklear implantlı çocuklarda sesin artikülasyonözelliklerinin değerlendirilmesi Amaç: Çalışmanın amacı, koklear implantasyonun artikülasyona olanetkisini voice onset time (VOT) kullanarak araştırmaktır.Yöntem:Bu çalışmanın ilk aşamasında işitme kaybı olmayan 25 çocuk ele alındı. Bu yaş grubuna ait /p/, /b/, /t/, /d/, /k/, /g/ Türkçe patlayıcı ünsüzlerinin VOT değerleri hesaplandı ve standardizasyon sağlandı. Bu amaç için Kay Elemetrics CSL 4400 (Key Elemetrics Ltd,Lincoln Park, NJ, ABD) programı kullanıldı. Bu VOT değerleri referans alınarak kliniğimizde koklear implant yapılmış olan ve yaşları4-11 arasında değişen 40 çocuk, koklear implantasyon süresi baz alınarak 6 gruba ayrıldı ve bu gruplarda VOT çalışıldı. Bu gruplar hemkendi içerisinde hem de sağlıklı çocuklar ile karşılaştırıldı. Bulgular:İmplant kullanım süresi arttıkça ünsüzlerin VOT değerlerinin yükselerek normal işiten çocuklara yaklaştığı, 4 yıl ve üzeri koklearimplant kullanımı sonunda bu değerlerin normal grubu yakaladığı görüldü. Sonuç:Bulgularımız erken implantasyonun ve yeterli süre implantkullanımının artikülasyon yani konuşmanın anlaşılabilirliği üzerineolumlu bir etkisi olduğunu gösterdi. Koklear implantın konuşma gelişimi üzerine olan etkisinin değerlendirilmesinde VOT'un kullanılabileceğini düşündük.

Evaluation of the articulatory characteristics of voice in cochlear implanted children

Objective:To investigate the effect of cochlear implantation on articulation by using voice- onset time (VOT). Methods:At the first phase of this study, a total of 25 children withouthearing loss were examined. VOT values of Turkish plosive consonantsof /p/, /b/, /t/, /d/, /k/, /g/ specific to this age group were estimated, andtheir standardization was achieved. To this end, Kay Elemetrics CSL4400 software (Key Elemetrics Ltd, Lincoln Park, NJ, USA) was used.Referencing these VOT values, 40 children ages ranging between 4 and11 years who underwent cochlear implantation in our clinic were divided into six groups based on the duration of cochlear implantation, andVOT values were determined in these groups. These groups were compared within themselves, and with healthy children. Results: VOT values of consonants increased as the duration of cochlearimplantation increased and approached to those of the children with normal hearing, and at the end of four years of cochlear implant use, theycaught up with those of the normal hearing group. Conclusion:Our results have shown that early stage implantation, anduse of implant for an adequate time period have a favorable impact onarticulation in other words on comprehensibility of speech. We thoughtthat VOT can be use in the evaluation of the effect of cochlear implanton the development of speech.

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1. Lane H, Perkell JS. Control of voice-onset time in the absence of hearing: a review. J Speech Lang Hear Res 2005;48:1334- 43.
2. McCrea CR, Morris RJ. Effects of vocal training and phonatory task on voice onset time. J Voice 2007;21:54-63.
3. Robb M, Gilbert H, Lerman J. Influence of gender and environmental setting on voice onset time. Folia Phoniatr Logop 2005;57:125-33.
4. Ogut F, Kilic MA, Engin EZ, Midilli R. Voice onset time for Turkish stop consonants. Speech Commun 2006;48:1094-9.
5. McCrea CR, Morris RJ. The effects of fundamental frequency level on voice onset time in normal adult male speakers. J Speech Lang Hear Res 2005;48:1013-24.
6. Lisker L, Abramson AS. A cross-language study of voicing in initial stops: acoustic measurements. Word 1964;20:384-422.
7. Dalgic A, Kandogan T, Aksoy G. Voice onset time for Turkish stop consonants in adult cochlear implanted patients. Indian J Otolaryngol Head Neck Surg 2015;67:308-13.
8. Kant AR, Patadia R, Govale P, Rangasayee R, Kirtane M. Acoustic analysis of speech of cochlear implantees and its implications. Clin Exp Otorhinolaryngol 2012 Apr;5 Suppl 1:S14-8.
9. Grandon B, Vilain A, Loevenbruck H, Schmerber S, Truy E. Realisation of voicing by French-speaking CI children after longterm implant use: an acoustic study. Clin Linguist Phon 2017;31:598-611.
10. Maddieson I. Phonetic Universals. In: The handbook of phonetic sciences. Laver J, Hardcastle WJ, editors. Oxford: Blackwell; 1997. p. 619-39.
11. Halle M, Stevens KN. On the mechanism of glottal vibration for vowels and consonants. MIT Quarterly Progress Report 1967;85:267-71. 12. Fischer-Jorgensen E. Acouistic analysis of stop consonants. Miscallanea Phonetica 1954;42-59.
13. Lindblom B. Vowel duration and a model of lip mandible coordination. Speech Transmission Laboratory, Quarterly Progress and Status Report. Stockholm: Royal Institute of Technology; 1967. p. 1-29.
14. Lisker L. On "explaining" vowel duration variation. Glossa 1974;8: 233-46.
15. Lehiste I. Suprasegmentals. Cambridge, MA: MIT Press; 1978. p. 187-92.
16. Docherty G. The timing of voicing in British English obstruents. New York, NY: Foris; 1992. p. 18-27. 17. Jessen M. Phonetics and phonology of tense and lax obstruents in German. Amsterdam: John Benjamins; 1998; p. 113-7.
18. Kant AR, Patadia R, Govale P, Rangasayee R, Kirtane M. Acoustic analysis of speech of cochlear implantees and its implications. Clin Exp Otorhinolaryngol 2012;5 Suppl 1:S14-8.