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Related Experiment Videos

Speech dysfluency and manual specialization in Down's syndrome.

D A Devenny1, W P Silverman

  • 1Institute for Basic Research in Developmental Disabilities, New York State Office of Mental Retardation and Developmental Disabilities, Staten Island. 10314.

Journal of Mental Deficiency Research
|June 1, 1990
PubMed
Summary

Adults with Down syndrome who were not strongly right-handed showed more speech dysfluency, including stuttering. This suggests differences in speech motor control and brain dominance in this population.

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Area of Science:

  • Neuroscience
  • Speech-Language Pathology
  • Genetics

Background:

  • Down syndrome is associated with various developmental differences.
  • Speech dysfluency, particularly stuttering, is observed in some individuals with Down syndrome.
  • Manual lateralization (hand preference) can vary in neurodevelopmental conditions.

Purpose of the Study:

  • To investigate the relationship between speech dysfluency and manual lateralization in adults with Down syndrome.
  • To determine if non-right-handedness is associated with increased dysfluency in this population.
  • To explore potential links to cerebral dominance and speech motor control.

Main Methods:

  • Studied 31 adults with Down syndrome.
  • Analyzed speech samples from videotapes to assess dysfluency frequency.

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  • Measured manual lateralization using the preferred hand for five common objects.

    • Main Results:

    • 42% of subjects exhibited stuttering, with a wide range of dysfluency.
    • 61% showed a right-hand preference, 13% a left-hand preference, and 39% were mixed-handed.
    • Increased speech dysfluency correlated with non-right-handedness, independent of general language or intellectual deficits.

    Conclusions:

    • Findings suggest variations in speech motor control systems in adults with Down syndrome.
    • Anomalous cerebral dominance may be linked to speech dysfluency and non-right-handedness.
    • Further research is warranted to understand the neurobiological underpinnings.