دوره 8، شماره 6: 1391:1045-1053

<ArticleSet>
<Article>
<Journal>
<PublisherName></PublisherName>
<JournalTitle>Journal of Research in Rehabilitation Sciences</JournalTitle>
<Volume>1</Volume>
<Issue>1</Issue>
<PubDate>
<Year>2012</Year>
<Month>12</Month>
<Day>03</Day>
</PubDate>
</Journal>
<VernacularTitle>Comparing the formant frequencies of three Persian long vowels produced by cochlear-implanted and normal-hearing children</VernacularTitle>
<FirstPage>1045</FirstPage>
<LastPage>1053</LastPage>
<Language>FA</Language>
<AuthorList>
<Author>
<FirstName>Narges</FirstName>
<LastName>Jafary</LastName>
<Affiliation>PhD Student, Academic Member, Department of Speech Therapy, School of Rehabilitation Sciences, Tehran University of Medical Sciences, Tehran, Iran. soniajafary11@gmail.com</Affiliation>
</Author>
<Author>
<FirstName>Farhad</FirstName>
<LastName>Torabineghad</LastName>
</Author>
<Author>
<FirstName>Moharam</FirstName>
<LastName>Eslami</LastName>
</Author>
<Author>
<FirstName>Ali</FirstName>
<LastName>Ghorbani</LastName>
</Author>
<Author>
<FirstName>Shohreh</FirstName>
<LastName>Jalaei</LastName>
</Author>
<Author>
<FirstName>Jalal</FirstName>
<LastName>Sameni</LastName>
</Author>
<Author>
<FirstName>Elham</FirstName>
<LastName>Mahmoudi</LastName>
</Author>
<Author>
<FirstName>Mohammad Hossein</FirstName>
<LastName>Nilfroush</LastName>
</Author>
<Author>
<FirstName>نرگس</FirstName>
<LastName>جعفری</LastName>
</Author>
<Author>
<FirstName>فرهاد</FirstName>
<LastName>ترابی نژاد</LastName>
</Author>
<Author>
<FirstName>محرم</FirstName>
<LastName>اسلامی</LastName>
</Author>
<Author>
<FirstName>علی</FirstName>
<LastName>قربانی</LastName>
</Author>
<Author>
<FirstName>شهره</FirstName>
<LastName>جلایی</LastName>
</Author>
<Author>
<FirstName>جلال</FirstName>
<LastName>ثامنی</LastName>
</Author>
<Author>
<FirstName>الهام</FirstName>
<LastName>محمودی</LastName>
</Author>
<Author>
<FirstName>محمد حسین</FirstName>
<LastName>نیلفروش</LastName>
</Author>
</AuthorList>
<History>
<PubDate>
<Year>2012</Year>
<Month>10</Month>
<Day>11</Day>
</PubDate>
<PubDate>
<Year>2012</Year>
<Month>11</Month>
<Day>21</Day>
</PubDate>
<PubDate>
<Year>2012</Year>
<Month>11</Month>
<Day>28</Day>
</PubDate>
</History>
<Abstract>Introduction: The feedback provided by auditory apparatus equips normal hearing people with an important controlling mechanism over the speech production processes. The speech of hearing-impaired children is both perceptually and acoustically abnormal. This study tried to compare the formant frequencies of three long vowels in Persian-speaking children who used cochlear implant and those who were of normal-hearing ability.Materials and Methods: 20 Cochlear-implanted (CI) children and 20 normal-hearing children with the age ranged from 5 to 10 years participated in this study. All participants were native speakers of Persian who were asked to produce prolonged vowels /i/, /u/ and /ɒ/. The averaged F1 and F2 were calculated for each examinee using Praat software (version 5.3.13). Independent t test was conducted to examine the possible differences thatF1 and F2 values and F2 to F1 ratios may have in the two groups.Results: Study results revealed a relative increase in the F1 mean values of all the three vowels produced by CI children. This difference was, however, significant only in the first formant of vowel /i/ (P = 0.011).The mean values of F2/F1 ratio for vowel /i/ showed a statistically significant difference between the two groups (P = 0.01).Conclusion: F1 formants are increased in cochlear-implant children. This condition might be due to a process in which the lack of auditory feedback is compensated by the proprioceptive feedback that is provided through the exaggerated articulation. The changes in F1 and F2 imply a reduced vowel space, in other words, vowel space is slightly centralized in CI children.Keywords: Acoustic analysis, Formant frequency, Cochlear implant, Natural speech, Persian</Abstract>
</Article>
</ArticleSet>

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