Date of Award

5-2015

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Communication Disorders, Special Education & Disability Services

First Advisor

Lori Lombard, Ph.D.

Second Advisor

Lisa Hammett Price, Ph.D. CCC-SLP

Third Advisor

Shari Robertson, Ph.D. CCC-SLP

Abstract

Laryngeal diadochokinesis (LDDK) tasks examine fine motor function of the vocal folds. Existing literature lacks normative LDDK data. The purpose of this study was to establish normative LDDK consistency values for adults ages 40 to 60 years, determine if there is a difference in consistency of production between the adductory task /ʌ/ and the abductory task /hʌ/, and determine if there is a difference in consistency of production between male and female participants. Participants included fifty-seven adults aged 40-60 who were instructed to produce three trials of /ʌ/ and /hʌ/ for seven seconds each. Trials were analyzed for consistency. Normative values were recorded. Results indicated a difference in consistency of production between /ʌ/ and /hʌ/. However, results indicated no differences in consistency of productions between genders. The data established in this study provides a foundation for future research to collect additional data on LDDK rate, consistency, and strength of production.

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