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Related Experiment Videos

Volitional control of involuntary movements.

W C Koller1, N M Biary

  • 1Department of Neurology, University of Kansas Medical Center, Kansas City 66103.

Movement Disorders : Official Journal of the Movement Disorder Society
|January 1, 1989
PubMed
Summary

Voluntary suppression of abnormal movements is possible in many disorders beyond tics. However, tics are more easily suppressed and for longer durations, suggesting suppressibility alone shouldn't classify movement disorders.

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Area of Science:

  • Neurology
  • Movement Disorders

Background:

  • Voluntary suppressibility of abnormal movements is a known characteristic of tics.
  • This ability has not been systematically studied in other movement disorders.

Purpose of the Study:

  • To assess the voluntary suppressibility of movements in various neurological conditions.
  • To determine if movement suppressibility is a unique characteristic of tics or a broader phenomenon.

Main Methods:

  • 146 patients with tremors and dyskinetic disorders were evaluated.
  • Patients attempted to suppress movements through mental concentration.
  • The duration of voluntary movement suppression was recorded via videotaping.

Main Results:

  • 100% of patients with tics suppressed movements (avg. 2.5 min).

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  • Suppressibility varied across other disorders: essential tremor (2%), neuroleptic-induced tremor (80%), parkinsonian tremor (70%), chorea (50%), dystonia (20%).
  • Mental concentration worsened essential tremor in 24% of patients.

    • Conclusions:

    • Voluntary suppression of abnormal movements occurs in disorders other than tics.
    • Movement suppressibility is not a definitive characteristic for classifying movement disorders.
    • Tics demonstrate a higher degree and longer duration of voluntary suppressibility compared to other disorders.