Date of Award

8-2015

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Communication Disorders, Special Education & Disability Services

First Advisor

Lori E. Lombard, Ph.D., CCC-SLP

Second Advisor

Shari Robertson, Ph.D., CCC-SLP

Third Advisor

Karen Stein., M.S, CCC-SLP

Abstract

Laryngeal diadochokinesis (L-DDK) tasks, which use glottal production of syllables to assess laryngeal function and movement, have the potential to be a favorable diagnostic tool due to a noninvasive and easy-to-administer protocol. However, the major disadvantage of using L-DDK is the substantial lack of normative data. The purpose of this study was to establish normative L-DDK consistency values for young adults ages 20 to 40 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. Forty-two participants were instructed to produce three trials of /ʌ/ and /hʌ/ for seven seconds each. Each trial was analyzed for consistency. Normative values were recorded. Results indicated no statistical difference in consistency of production between /ʌ/ and /hʌ/, as well as no differences in consistency of productions between sexes. The data established in this study provides a foundation for future research to collect additional data, and to put L-DDK to practical use.

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