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Measurement of Spatial Stability in Precision Grip
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Published on: June 4, 2020

Dual task interference in psychogenic tremor.

Hatice Kumru1, Maaike Begeman, Eduardo Tolosa

  • 1Institute Guttmann, Badalona, Barcelona, Spain. hkumru@guttmann.com

Movement Disorders : Official Journal of the Movement Disorder Society
|August 4, 2007
PubMed
Summary

Psychogenic tremor (PT) patients and healthy volunteers showed dual-task interference, unlike Parkinson

Area of Science:

  • Neuroscience
  • Movement Disorders
  • Psychogenic Disorders

Background:

  • Psychogenic tremor (PT) is clinically and visually similar to voluntarily mimicked tremor.
  • Dual-task interference, where performing two tasks simultaneously impairs performance, is known in healthy individuals.
  • This interference may impact motor control, particularly during voluntary rhythmic movements.

Purpose of the Study:

  • To investigate whether patients with psychogenic tremor exhibit dual-task interference.
  • To differentiate psychogenic tremor from other tremor types (Parkinson's disease, essential tremor) using dual-task paradigms.
  • To assess the utility of dual-task interference in diagnosing psychogenic movement disorders.

Main Methods:

  • Study included patients with psychogenic tremor (PT), Parkinson's disease (PD), essential tremor (ET), and healthy normal volunteers (NV).

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  • Participants performed a unilateral simple reaction time task (SRT) under two conditions: at rest (rSRT) and during contralateral hand tremor (tSRT).
  • Reaction times were compared between the two conditions for each group.

    • Main Results:

    • Reaction time significantly increased from rSRT to tSRT in the PT and NV groups (P < 0.01).
    • No significant difference in reaction time was observed between rSRT and tSRT in the PD and ET groups.
    • Delayed reaction times in PT and NV suggest dual-task interference, unlike in PD and ET.

    Conclusions:

    • Dual-task interference, indicated by delayed reaction times during contralateral tremor, is present in psychogenic tremor and healthy volunteers.
    • This phenomenon is absent in Parkinson's disease and essential tremor, suggesting it can help differentiate these conditions.
    • Dual-task interference assessment may be a valuable tool for evaluating psychogenic movement disorders.