Abstract

This study examined the effect of speaking contexts on articulatory kinematics in habitual and clear speech conditions. Ten male and 10 female participants (ages 18"“29) completed speaking tasks in three contexts and two conditions. The contexts were word, phrase, and passage, with both mid-sentence and end of-sentence stimuli in the phrase and passage contexts. The two conditions were habitual and clear speech. Participants had sensors attached to the mid-tongue, jaw, lower lip, and upper lip, and an electromagnetic articulograph tracked their movements. Three tokens for each stimulus were analyzed for duration, displacement, and velocity. Articulatory coordination was measured through absolute and percent jaw contribution, and displacement correlations. Statistical analysis revealed significant changes across both conditions and contexts. Generally, the articulator movements were larger for clear versus habitual speech and decreased progressively in size from word to phrase to passage. Duration significantly increased in the clear speech condition and decreased from word to phrase to passage, which likely underlies the changes seen in the other measures. Percent jaw contribution to lower lip movement was significantly higher in the clear speech condition, percent jaw contribution to tongue movement was significantly higher for the passage compared to the other contexts, and jaw and lower lip correlations with the tongue were higher in the clear condition and lower in the passage context. Incidental rate variation and motor equivalence across speakers limit the degree to which we can interpret these results in terms of articulatory coordination. Overall, this study demonstrates significant changes in speech kinematics across contexts in both clear and habitual conditions, indicating that researchers should exercise caution when generalizing findings from studies using short, contrived stimuli.

Degree

College and Department

David O. McKay School of Education; Communication Disorders

Rights

https://lib.byu.edu/about/copyright/