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Related Experiment Videos

Tics and developmental stuttering.

Hilda F Mulligan1, Tim J Anderson, Richard D Jones

  • 1Christchurch Brain Research Group, Christchurch, New Zealand. hilda.mulligan@chmeds.ac.nz

Parkinsonism & Related Disorders
|June 5, 2003
PubMed
Summary
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People who stutter exhibit more involuntary movements (IMs), primarily simple and complex motor tics (CMTs), compared to controls. This suggests a shared basal ganglia dysfunction in stuttering and tics.

Area of Science:

  • Neuroscience
  • Speech-language pathology

Background:

  • Developmental stuttering affects 1% of the population with unclear etiology.
  • Neuroimaging suggests basal ganglia or cortical connection dysfunction may underlie stuttering.

Purpose of the Study:

  • To identify and characterize involuntary movements (IMs) in individuals with developmental stuttering.
  • To test the hypothesis that these IMs resemble those seen in basal ganglia movement disorders.

Main Methods:

  • Audio-videotaped 16 adults who stutter and 16 controls speaking and reading.
  • Analyzed audio for dysfluencies and video for involuntary movements (IMs).

Main Results:

  • Stuttering subjects showed significantly more IMs than controls during speech and reading.

Related Experiment Videos

  • Most IMs were tics; complex motor tics (CMTs) were more prevalent in stuttering subjects.
  • Specific tics and dystonia were observed exclusively in the stuttering group.

    • Conclusions:

    • Developmental stuttering is linked to prevalent simple and complex motor tics (CMTs).
    • The findings suggest a shared pathophysiology between tics and stuttering.
    • This supports the theory of basal ganglia dysfunction in stuttering.