Suman Kumar

Electroglottographic Parameterization of the Effects of Gender, Vowel and Phonatory Registers on Vocal Fold Vibratory Patterns: An Indian Perspective

In-depth study on laryngeal biomechanics and vocal fold vibratory patterns reveal that a single vibratory cycle can be divided into two major phases, the closed and open phase, which is subdivided into opening and closing phases. Studies reveal that the relative time course of abduction and adduction, which in turn is dependent on the relative relaxing and tensing of the vocal fold cover and body, to be the determining factor in production of a particular vocal register like the modal (or chest), falsetto, glottal fry registers. Studies further point out Electroglottography to be particularly suitable for the study of vocal vibratory patterns during register changes. However, to date, there has been limited study on quantitative parameterization of EGG wave form in vocal fry register. Moreover, contradictory findings abound in literature regarding effects of gender and vowel types on vocal vibratory patterns, especially during phonation at different registers. The present study endeavors to find out the effects of vowel and gender differences on the vocal fold vibratory patterns in different registers and how these would be reflected in standard EGG parameters of Contact Quotient (CQ) and Contact Index (CI), taking into consideration the Indian sociolinguistic context. Electroglottographic recordings of 10 young adults (5 males and 5 females) were taken while the subjects phonated the three vowels /a/,/i/,/u/ each in two vocal registers, modal and vocal fry. Obtained raw EGG were further normalized using the Derived EGG algorithm and theCQ and CI values were derived. Obtained data were subject to statistical analysis using the 3-way ANOVA with gender, vowel and vocal register as the three variables. Post-hoc Dunnett C multiple comparison analysis were also performed. Results reveal that CQ values are significantly higher in vocal fry than modal phonation for both males and females, indicating a relatively hyperconstricted vocal system during vocal fry. The males have significantly greater CQ values than females both at modal and vocal fry phonations which indicate that the males are predisposed to greater vocal fold constriction. Females demonstrated no significant increase in CI values in vocal fry state; and in some cases actually decrease in the CI values which suggest an inherently distinct vocal fold physiological adjustment from that in males. No vowel effects were found in any conditions. Perturbation values (CQP and CIP) are significantly more in vocal fry register than in modal register, and the increase was more in case of females than males. The findings give strong evidence to certain hypotheses in literature regarding effects of vowel, gender and phonatory register on vocal fold vibratory patterns.

Laryngeal Aerodynamics in Children with Hearing Impairment versus Age and Height Matched Normal Hearing Peers.

Lack of proper auditory feedback in hearing-impaired subjects results in functional voice disorder. It is directly related to discoordination of intrinsic and extrinsic laryngeal muscles and disturbed contraction and relaxation of antagonistic muscles. A total of twenty children in the age range of 5–10 years were considered for the study. They were divided into two groups: normal hearing children and hearing aid user children. Results showed a significant difference in the vital capacity, maximum sustained phonation, and fast adduction abduction rate having equal variance for normal and hearing aid user children, respectively, but no significant difference was found in the peak flow value with being statistically significant. A reduced vital capacity in hearing aid user children suggests a limited use of the lung volume for speech production. It may be inferred from the study that the hearing aid user children have poor vocal proficiency which is reflected in their voice. The use of voicing component in hearing impaired subjects is seen due to improper auditory feedback. It was found that there was a significant difference in the vital capacity, maximum sustained phonation (MSP), and fast adduction abduction rate and no significant difference in the peak flow.

Adaptation of The Western Aphasia Battery in Bangla

Abstract Aphasia following an acquired neurological insult necessitates an in-depth evaluation of the primary and secondary language symptoms. Of all the tools available for aphasia diagnosis, the Western Aphasia Battery (WAB; Kertesz, 1982) has proved to be one of the most comprehensive test batteries for describing the aphasia symptom complex. Several authors have pointed out the need for language-specific tools for the assessment of aphasia. But in Bengali, the most prevalent language in eastern India, no formal language assessment tool was available to date. The present study adapted the original WAB in Bengali to give the Bengali WAB (B-WAB). The study was completed in three phases: development, standardization and validation of the B-WAB. The test material was developed preserving the total number of items, however minor changes were made wherever necessary so that it matched the sociolinguistic norms in this part of the country. It was standardized in a group of 150 normal individuals in five different age groups ranging from 18-70 years, and normative values were provided for each subtest for each group. For establishing validity, it was administered to 30 aphasic subjects and the results indicated that the B-WAB was a valid tool for testing individuals with aphasia.

The Effect of Menstrual Cycle on Nasal Resonance Characteristics in Females

The purpose of this study was to analyze resonance characteristics (nasality and nasalance values) during the menstrual cycle. Previous studies indicate changes in voice quality and nasal mucosa due to temporary falling estrogen levels in human females during their menstrual cycle. The present study compared the nasality and “nasalance scores” obtained on 15 healthy participants. The first assessment was done during the first 3 days of the menses and a second assessment was done during postmenstrual ovulation phases using Nasometer II software, and a perceptual nasal resonance assessment was done using Buffalo III Voice Profile. The results revealed significant increases in the nasalance values during the menstruation phase. The findings indicate that hormonal and other related changes occurring during menstruation leads to a significant change in the resonance characteristics of voice.

Right Hemisphere Language Battery in Hindi

Communicative deficits are identified by the Speech-Language Pathologists (SLPs) which are otherwise attributed to a loss of memory, attention, or visual-perceptual skills. Tools to measure right hemisphere functions have been developed in only two Indian languages (Kannada and Malayalam), but no test has been developed in Hindi. Hundred participants were considered for the study. They were divided into three groups- eighty normal participants (Group-I) and ten Hindi speaking diagnosed right hemisphere vascular damaged participants (Group- II) and ten Hindi speaking diagnosed left hemisphere vascular damaged participants (Group-III). There is no significant difference existed between the performance of the participants between Right Hemisphere Language Battery (RHLB) and Right Hemisphere Language Battery in Hindi (RHLB-H) across all the subtests at α = 0.05 level of significance. A significant difference exists between the obtained mean scores among the normal control participants and Right Hemisphere Disorder (RHD) participants at α = 0.05 level significance. ANOVA test results showed that RHD participants had a significantly higher discourse error rating than either Left Hemisphere Disorder (LHD) or controls. Furthermore, the Tukey’s Honest Significant Difference (HSD) Post-Hoc test reveals that there is a decrease in the obtained mean scores from Normal Control participants to the LHD and RHD groups in order. It can thus be concluded that there is a significant difference in the mean scores across all the three groups.

Phonological Development in Bangla: A Normative Study

This study investigates the various phonological processes operational in the speech of 90 native Bangla spoken children between the age of 3;0 – 3;11 years. The speech of all children was recorded during the administration of the developed word list and was transcribed for analysis. Equality of proportions was used to investigate the observed pattern of variation in speech. Overall this study has established two aspects of speech development: age at which the error patterns were suppressed and the percentage of children exhibiting the obtained phonological processes. Processes like medial consonant deletion, unstressed syllable deletion, /l/ deletion, vowel unrounding, alveolar fronting, denasalization, stopping (except stopping of affricates and fricatives), palatalization and monothongization were eliminated by 3 years 5 months, while nasalization, backing of stops, initial consonant deletion, and coalescence were not found in age beyond 3 years and 9 months. Processes like vowel rising, nasalization, stopping, nasal assimilation, stop assimilation, velar fronting, and deaffrication decreased significantly as the chronological age progressed from 3 to 4 years. Other processes like cluster reduction, epenthesis, final consonant deletion, deaspiration, /r/ deletion, affrication (of fricatives), liquid replacement, and fronting of retroflex were considered to persist beyond 4 years of age. The results however refute the fact that, the mastery of phonological system is completed by 4 years of age. Native Bangla speaking children continues to use simplification for clusters, final consonants, fricatives, liquids, retroflex sounds, and the aspirated counterparts of stops, even after the age of four. The results thus provide a profile of the underlying rules a typically developing child uses, which can be served as a basis for planning remediation. Also information about typical errors helps to delineate the normal course of acquisition; consequently, a child’s atypical phonologic development can be evaluated against normal or typical error patterns.

A Comparative Study of Trained and Untrained Rabindrasangeet Singers

This scientific paper proposes an analytic framework specifically for Rabindrasangeet singing that models the time-varying physical and expressive characteristics unique to an individual voice through a phonetogram analysis. The present study incorporates the most popular Rabindrasangeet into account for analysis to get an idea about the specific numerical data regarding the fundamental frequency, semitones, SPL range, and area as well as to give a precise guideline to those clients. While comparing the trained and untrained singers both males and females the F0 parameter is found to be louder in trained group. The mean semitone is always higher in females than in males and the trained male subjects have significantly higher SPL range than trained female subjects and trained females have higher SPL range than untrained female subjects. The enclosed area is larger in trained singers and more in females than males. Results of this study indicate differences between untrained and trained phonetograms. These differences can be attributed to greater natural capacities in trainedsubjects or a superior learned control over the voice mechanism.