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Functional (psychogenic) stereotypies.

José Fidel Baizabal-Carvallo1,2, Joseph Jankovic3

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Functional stereotypies (FS) are a distinct subtype of functional movement disorders (FMDs). Differentiating FS from tardive dyskinesia (TD) is possible using specific clinical and demographic features.

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Area of Science:

  • Neurology
  • Psychiatry
  • Movement Disorders

Background:

  • Functional movement disorders (FMDs) encompass diverse presentations, including stereotypic movements.
  • Distinguishing FMDs from other movement disorders is crucial for accurate diagnosis and management.

Purpose of the Study:

  • To characterize the phenomenology of functional stereotypies (FS).
  • To compare FS features with those of tardive dyskinesia (TD).

Main Methods:

  • Retrospective analysis of 184 FMD patients to identify 19 with FS.
  • Phenomenological comparison of FS patients with 65 TD patients.

Main Results:

  • FS patients exhibited sudden onset (84%), distractibility (58%), and unexplained improvements (84%).
  • Key differences from TD included younger age at onset, lack of self-biting, and associated functional tremor/abnormal speech.
  • Lack of self-biting (sensitivity 1.0) and abnormal speech (specificity 0.9) aided diagnosis of functional orolingual dyskinesia.

Conclusions:

  • Functional stereotypies are a recognized clinical manifestation within the FMD spectrum.
  • Distinct clinical and demographic characteristics aid in differentiating FS from TD.