Changes in movement transitions across a practice period in childhood apraxia of speech

Maria Grigos, Julie Case

Research output: Contribution to journalArticle

Abstract

This study examined changes in speech motor control across a movement transition between sounds within a motor learning task in children with apraxia of speech (CAS) and typical development (TD). It was investigated whether oral articulator movement was refined with practice and whether practice gains generalized to words not included in the practice session. A total of 16 children (ages 5–6) with CAS (n = 8) and TD (n = 8) participated in this study. Novel and real word tokens were produced at three time points. Kinematic data was collected using facial motion tracking at each time point. Children completed a practice session following baseline data collection session that integrated motor learning principles. Three tokens were included in the practice session and the remaining stimuli assessed carryover of practice gains. Kinematic data was then collected immediately following practice and 3 days later. Kinematic analyses were conducted on the movement gesture for the first syllable of each word. Narrow transcription analyses examined speech production accuracy. Children in the CAS group displayed increased consonant and vowel accuracy only for the practised tokens. Adjustments to spatial control and movement variability were observed in the CAS group, though only for practised words. Children in the TD group altered spatial and temporal domains of movement and variability across both practised and non-practised tokens. Interestingly, the CAS group displayed a pattern of increased displacement along with decreased variability, which was not observed in the TD group. The degree to which these findings reflect facilitative or maladaptive changes are discussed. Results are also interpreted in relation to vowel properties, novel/real word status and variable practice of novel and real words.

Original languageEnglish (US)
Pages (from-to)1-27
Number of pages27
JournalClinical Linguistics and Phonetics
DOIs
StateAccepted/In press - Dec 28 2017

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Apraxias
childhood
Biomechanical Phenomena
Group
Learning
Social Adjustment
Childhood Apraxia of Speech
Gestures
learning
stimulus
Apraxia of Speech

Keywords

  • childhood apraxia of speech
  • Movement transitions
  • speech motor learning

ASJC Scopus subject areas

  • Language and Linguistics
  • Linguistics and Language
  • Speech and Hearing

Cite this

Changes in movement transitions across a practice period in childhood apraxia of speech. / Grigos, Maria; Case, Julie.

In: Clinical Linguistics and Phonetics, 28.12.2017, p. 1-27.

Research output: Contribution to journalArticle

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