Date of Award


Document Type


Degree Name

Master of Science (MS)


Special Education and Clinical Services

First Advisor

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

Second Advisor

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

Third Advisor

Cynthia McCormick Richburg, Ph.D., CCC-A

Fourth Advisor

Jill L. Brady, Ph.D., CCC-SLP


This study compared the production rates (in repetitions per second) of adductory and abductory laryngeal diadochokinetic (LDDK) tasks, 'uh' and 'huh,' and sought to establish normative LDDK rates for adults. These tasks require fine motor control of the larynx to produce rapid, consistent repetition of the glottal syllables 'uh' and 'huh.' In the current literature, assumptions have been made that performance of LDDK tasks could possibly predict laryngeal function during speech and swallowing. Before those assumptions can be tested, normative data on LDDK performance must be established. Very few studies have been conducted that identify LDDK values. The studies that do provide data on LDDK performance are inconsistent in tasks, population and measurement. This study explores normative data collection procedures for the two LDDK tasks. Results of the comparison between LDDK tasks are discussed and normative LDDK rates are presented. Clinical implications for the use of LDDK are discussed.