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Related Experiment Video

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Differentiating tics from functional (psychogenic) movements with electrophysiological tools.

Felipe Vial1,2, Sanaz Attaripour1, Mark Hallett1

  • 1National Institutes of Health, NINDS, Human Motor Control Section, Building 10, 9000 Rockville Pike, Bethesda, MD 20892, USA.

Clinical Neurophysiology Practice
|December 31, 2019
PubMed
Summary

Diagnosing functional movement disorders versus tic disorders can be challenging. Electrophysiological tools, like polyelectromyography and Bereitschaftspotential, aid in differentiating these conditions.

Keywords:
BereitschaftspotentialFunctional movementPsychogenic movementTic

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Area of Science:

  • Neurology
  • Movement Disorders
  • Clinical Electrophysiology

Background:

  • Differentiating functional movement disorders (FMDs) from tic disorders is clinically significant.
  • Both conditions can present with similar involuntary movements, posing diagnostic challenges.

Observation:

  • Two patients presented with involuntary movements: a young woman with neck flexion and an older man with trunk jerks.
  • Polyelectromyographic (EMG) studies and observation of the readiness potential (Bereitschaftspotential) were utilized.

Findings:

  • EMG studies and Bereitschaftspotential analysis provided crucial data for accurate diagnosis.
  • These electrophysiological tools helped distinguish between FMD and tic disorder in both cases.

Implications:

  • Electrophysiological methods offer objective measures to aid in the differential diagnosis of movement disorders.
  • Integrating these tools can improve diagnostic accuracy and guide appropriate treatment strategies for patients with FMDs and tic disorders.