Date of Award
Master of Science (MS)
Communication Disorders, Special Education & Disability Services
Lori Lombard, Ph.D.
Lisa Hammett Price, Ph.D. CCC-SLP
Shari Robertson, Ph.D. CCC-SLP
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.
Mack, Molly E., "Laryngeal Diadochokinetic Consistency in the Adult Population" (2015). Theses and Dissertations (All). 1247.