Date of Award


Document Type


Degree Name

Master of Science (MS)


Communication Disorders, Special Education & Disability Services

First Advisor

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

Second Advisor

David W. Stein, Ph.D., CCC-SLP

Third Advisor

Lisa Hammett Price, Ph.D., CCC-SLP


Laryngeal diadochokinesis (L-DDK) is a measurement used by speech-language pathologists to identify and assess laryngeal function. The current research on L-DDK, however, is lacking normative data to make it clinically useful for evaluations. There are also several inconsistencies found in the current research that limit the reliability of L-DDK measures. This research study aims to bridge this gap in the research by establishing normative data on L-DDK strength measurements in the geriatric population (60-90 years of age). Twenty participants (10 male and 10 female) produced two laryngeal tasks for a period of seven seconds for three trials each. Normative L-DDK data including mean, standard deviation, and range were collected for two different strength measurements, rise time and average amplitude. Results revealed no statistically significant differences in L-DDK strength values between the adductory task and the abductory task, nor between male and female participants.