Abstract
Electroglottography (EGG) is a method to monitor the vibrations of the vocal folds by measuring the varying impedance to a weak alternating current through the tissues of the neck. Non-invasive measures of vocal fold activity are useful for describing normal and disordered voice production. Measures of open, closed and speed quotient from glottal airflow and electroglottographic (EGG) waveforms have been used to describe timing events associated with vocal fold vibration. There are very few studies in western context and no Indian studies were done using speech task. The aim of the present study was to analyze the laryngeal behavior of individuals with chronic laryngitis using electroglottograph on reading voiced passage and to compare with normal individuals. 10 adults with chronic laryngitis and 10 age and gender matched normal adults in the age range of 30 – 40 years
participated in the present study. All the recorded samples were analyzed for contact quotient (CQ), open quotient (OQ) and speed quotient (SQ). Results indicated that there was significant statistical difference between normal and abnormal group on all the three EGG quotients for voiced passage reading task. These results also suggested that the closed duration during vocal fold vibratory pattern was longer in individuals with chronic laryngitis and open duration was reduced thereby reducing the speed quotient which indicates the asymmetry of vocal fold vibration during reading passage task in these individuals. It also suggest that connected speech context, as in passage reading, can give better representation, due to the fact that passage is more representative to one’s daily speech characteristics than sustained phonation. The laryngeal measures obtained from connected speech context offer a more accurate representation in differentiating normal versus pathological voices. Implications of the findings are discussed and topics for further exploration are identified
References
of Electroglottography in voice disorders. Indian
Journal of Otolaryngology and Head & neck
surgery. 53(4), 289 – 290.
Baken, R. J. (1992). Electroglottography. Journal of
Voice, 6, 98-110.
Baken, R. J., & Orlikoff, R. F. (2000). Clinical
measurement of speech and voice (2nd edn.) San
Diego: Singular publishing group, Inc.
Balakrishna, M. N. (1993). Contact quotient as a
glottal efficiency indicator. Unpublished master‟s
dissertation submitted to University of Mysore,
Mysore.
Chandrashekar, K. R. (1987). EGG in dysphonics.
Unpublished master‟s dissertation, University of
Mysore, Mysore.
Childers, D. G., Smith, A. M., & Moore, G. P. (1984).
Relationship between electroglottograph, speech,
and vocal cord contact. Folia Phoniatrica, 36,
105-118.
Colton, R. H., Casper, K J., & Leonnard, R. (2005).
Understanding voice problems: a physiological
perspective for diagnosis and treatment, San
Diego: Singular Publishing Group.
Dejonckere, P. H., & Lebacq, J. (1985).
Electroglottography and vocal nodules. An
attempt to quantify the shape of the signal. Folia
Phoniatrica, 37, 195-200.
Fourcin, A. J. (1986). Electrolaryngographic
assessment of vocal fold vibration. Journal of
Phonetics, 14, 435-442.
Fourcin, A., & Abberton, E. (2008). Hearing and
phonetic criteria in voice measurement: clinical
applications. Logopedics Phoniatrics Vocology,
33, 35-48.
Greene, M.C.L. (1980). The Voice and Its Disorders.
Philadelphia, PA: JB Lippincott.
Hanson, D.G., Gerratt, B.R., & Berke, G.S. (1990).
Frequency, intensity, and target matching effects
on photoglottographic measures of vocal quotient
and speed quotient. Journal of Speech and
Hearing Research, 33, 45-50.
Higgins, M.B., & Saxman, J. H. (1993). Inversefiltered
air flow and EGG measures for
sustained vowels and syllables. Journal of Voice,
7, 47-53.
Hirano, M. (1981). Clinical examination of voice. New
York: Springer- Verlag.
Hong, K.H., & Kim, H.K. (1997).
Electroglottography and laryngeal articulation in
speech. Folia Phoniatrica, 49, 225-233.
Kelman, A.W. (1981). Vibratory pattern of vocal
folds. Folia Phoniatrica, 33, 73-99.
Kent, R, D. (1997). The Speech Sciences. San Diego:
Singular Publishing Group.
Koster, J.P., & Smith, S. (1970). An interactive model
for the voice source. Folia Phoniatrica, 22, 92-
99.
Ma, E. P. M., & Love, A. L. (2010). Electroglottographic
evaluation of age and gender effects
during sustained phonation and connected speech.
Journal of voice, vol. 24(2), 146-152.
Micheal, J. F., & Wendahl, R. (1971). Correlates of
voice production. In L. E. Travis (Eds.),
Handbook of Speech Pathology and Audiology,
chapter 18 (pp 465-480), Englwood cliffs, NJ:
Prentice- Hall.
Rothenberg, M., & Mahshie, J. J. (1988). Monitoring
vocal fold abduction through vocal fold contact
area. Journal of Speech and Hearing Research,
31, 338-351.