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Related Experiment Videos

Relations between segmental and motor variability in prosodically complex nonword sequences.

Lisa Goffman1, Louann Gerken, Julie Lucchesi

  • 1Speech, Language, and Hearing Sciences, Heavilon Hall, Purdue University, 500 Oval Drive, West Lafayette, IN 47907, USA. goffman@purdue.edu

Journal of Speech, Language, and Hearing Research : JSLHR
|April 28, 2007
PubMed
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Prosodic prominence impacts speech accuracy and movement variability in children and adults. However, hierarchical foot structure affects speech segments but not motor control, suggesting distinct influences on speech production.

Area of Science:

  • Speech production research
  • Linguistics
  • Child language development

Background:

  • Understanding speech production involves examining segmental accuracy and articulatory movements.
  • Prosodic prominence and hierarchical foot structure are key linguistic elements influencing speech.
  • Variability in speech production can offer insights into underlying mechanisms.

Purpose of the Study:

  • To investigate the influence of prosodic prominence and hierarchical foot structure on segmental accuracy and variability.
  • To assess the impact of these linguistic factors on oral movement trajectory variability.
  • To compare these effects across young adults, typically developing children, and children with specific language impairment.

Main Methods:

  • A study involving 30 participants: 10 young adults, 10 typically developing children, and 10 children with specific language impairment.

Related Experiment Videos

  • Comparison of segmental error, segmental variability, and movement trajectory variability under conditions of low and high prosodic prominence (weak vs. strong syllables).
  • Analysis across different prosodic foot structures to evaluate their impact on speech production measures.

    • Main Results:

    • Children (both typically developing and with specific language impairment) exhibited greater segmental error, segmental variability, and movement trajectory variability compared to adults.
    • Weak syllables were produced with lower accuracy and increased lip and jaw movement variability than strong syllables, indicating prosodic prominence effects at both segmental and motor levels.
    • Hierarchical foot structure influenced segmental accuracy and variability but did not significantly affect motor measures of speech production.

    Conclusions:

    • Segmental and motor variables in speech production are not always aligned, indicating a complex relationship.
    • Clinical interpretations of motor variability should not solely rely on observations of segmental variability due to this misalignment.
    • Findings highlight distinct roles of prosodic prominence and hierarchical structure in shaping speech output.