A Kinematic Investigation of Speaking Rate Changes After Traumatic Brain Injury

作者：Kuruvilla Mili S^*; Murdoch Bruce E; Goozee Justine V

来源：Journal of Medical Speech - Language Pathology, 2012, 20(3): 9-18.

• dysarthria
• traumatic brain injury
• EMA assessment
• speech rate
• articulation
• articulatory dynamics

The primary aim of this investigation was to determine rate-related changes in tongue movement in dysarthric talkers after traumatic brain injury (TBI). Participants produced target consonants /t/ and /k/ embedded in syllable and sentence repetitions at typical as well as fast speaking rates. Tongue movement distance, velocity, acceleration, and deceleration were measured during the approach and release phases of target consonant production in the two rate conditions. Healthy talkers were observed to truncate tongue movements for syllable repetitions at a fast speaking rate. On the other hand, individuals with TBI modified the kinematic parameters associated with tongue movement speed. Task-based differences were evident across groups with the healthy talkers making rate-related changes only during syllable repetitions and the TBI group displaying alterations to tongue movement speed for both sentence and syllable tasks. Truncating articulatory gestures for syllable repetitions may reflect a speaker-selected strategy to economize effort. An increase in acceleration, deceleration, and velocity may reflect a strategy by dysarthric talkers to increase articulatory effort and avoid articulatory undershoot.

• 出版日期2012-9