L. Jancke, VARIABILITY AND DURATION OF VOICE ONSET TIME AND PHONATION IN STUTTERING AND NONSTUTTERING ADULTS, Journal of fluency disorders, 19(1), 1994, pp. 21-37
Eighteen male stutterers and 16 male nonstutterers who were matched ac
cording to age and social status were required to speak the testwords
/kakakas/, /tatatas/, and /papapas/ with stress on the middle syllable
at two different speech rates. Duration of phonation, voice onset tim
e, and coefficients of variation were computed and analyzed. It was sh
own that stutterers produced, even during nonstuttering periods under
repetitive articulation, an enhanced variation of voice onset time and
an increased variability for the duration of phonation associated wit
h the production of the first syllable. Furthermore, this experiment d
id not confirm the often reported differences in voice onset time and
vowel duration between stutterers and nonstutterers.