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Related Experiment Videos

Voluntary motor performance in psychotic disorders: a replication study.

F Schwartz1, A Carr, R Munich

  • 1Department of Psychiatry, Cornell University Medical College, Westchester Division, New York Hospital.

Psychological Reports
|June 1, 1990
PubMed
Summary

This study investigated motor performance across psychiatric disorders. Researchers found motor dysfunction was worse in schizophrenia and psychotic affective disorders, but not a continuum from depression through schizophrenia.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Motor Control

Background:

  • The relationship between psychosis and motor function is complex.
  • Previous research suggests potential links between psychotic disorders and motor deficits.
  • A continuum of psychosis from depression to schizophrenia has been hypothesized.

Purpose of the Study:

  • To investigate the hypothesis of a continuum of psychosis from depression through schizophrenia using voluntary motor performance.
  • To examine motor and neuropsychological performance across various psychiatric diagnoses.
  • To determine if current psychotic symptoms correlate with motor deficits.

Main Methods:

  • Voluntary motor performance tests including tapping speed, finger dexterity, and hand grip strength were administered.

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  • Neuropsychological motor performance was assessed in patients with schizophrenia, schizoaffective disorder, major depressive disorder, manic disorder, and nonpsychotic controls.
  • The influence of sex and psychotropic medications on motor performance was evaluated.

    • Main Results:

    • A continuum of motor dysfunction from depression through schizophrenia was not observed.
    • Current psychotic symptoms were not associated with motor or neuropsychological performance.
    • Motor performance was significantly impaired in individuals with schizophrenia, schizoaffective disorder, and psychotic affective disorders compared to nonpsychotic affective disorders.

    Conclusions:

    • The hypothesis of a psychosis continuum from depression to schizophrenia, based on motor performance, was not supported.
    • Psychoticism, defined by history, may represent a trait independent of specific diagnostic categories.
    • Motor deficits are more pronounced in schizophrenia spectrum and psychotic affective disorders than in nonpsychotic affective disorders.