LANGUAGE IN INDIA

Strength for Today and Bright Hope for Tomorrow

Volume 17:2 February 2017
ISSN 1930-2940

Managing Editor: M. S. Thirumalai, Ph.D.
Editors: B. Mallikarjun, Ph.D.
         Sam Mohanlal, Ph.D.
         B. A. Sharada, Ph.D.
         A. R. Fatihi, Ph.D.
         Lakhan Gusain, Ph.D.
         Jennifer Marie Bayer, Ph.D.
         G. Baskaran, Ph.D.
         L. Ramamoorthy, Ph.D.
         C. Subburaman, Ph.D. (Economics)
         N. Nadaraja Pillai, Ph.D.
         Renuga Devi, Ph.D.
         Soibam Rebika Devi, M.Sc., Ph.D.
Assistant Managing Editor: Swarna Thirumalai, M.A.

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Acoustic Analysis of Glottal Stops in
Tamil-Speaking Children with Cleft Lip and Palate

Biji Thomas, MASLP
Subramaniyan B., MASLP
Savitha, V.H., M.Sc (Sp. & Hg.).
Roopa Nagarajan, M.Sc. (Sp. & Hg.), MS (Sp. Path. & Aud.), USA

Abstract

This study aims to analyze the acoustic parameters of glottal stop in children with unilateral cleft lip and palate. Eighteen subjects in the age range between 8 &13 years, substituting glottal stops for oral stop consonants in Tamil language participated in the study. A total of 1944 tokens were generated. Inter-rater reliability of the perceptual rating by the judges showed good agreement, Kappa of 0.72. Tokens were acoustically analyzed for the voice onset time (VOT), burst duration, burst frequency and Closure duration using PRAAT software version 5.1.25. Two types of waveform patterns were observed. Only acoustic parameter could be measured for class A glottal stop is closure duration. Whereas for class B glottal stops in addition to closure duration, VOT burst duration and could be measured. These results suggest that, inclusion of acoustic analysis in the comprehensive assessment will complement the findings of perceptual evaluation.

Keywords: Glottal stop; Acoustic analysis; Inter-rater reliability

Introduction

Acoustic analysis of compensatory articulation in individuals with cleft lip and palate (CLP) can provide an objective measure for use in combination with perceptual judgments to more accurately identify articulatory patterns. Glottal stops produced by individuals with CLP are described diversely using acoustic analysis (Kido et al, 1992). As studies pertaining to assessment of glottal stop produced by children with CLP are sparse, this study acoustically analyses perceptually identified glottal stops in this group. It also seeks to identify the distribution of glottal stops across different voiceless stop consonants in Tamil language.

This is only the beginning part of the article. PLEASE CLICK HERE TO READ THE ENTIRE ARTICLE IN PRINTER-FRIENDLY VERSION.

Corresponding Author

B. Subramaniyan
Senior Assistant Professor, Department of Speech, Language and Hearing Sciences
Sri Ramachandra University, Porur
Chennai 600116
Tamilnadu
India
subramaniyanb@sriramachandra.edu.in
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