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Motor dysfunction and risk for schizophrenia.

E Walker1, N Lewis, R Loewy

  • 1Department of Psychology, Emory University, Atlanta, GA 30322-2470, USA.

Development and Psychopathology
|October 26, 1999
PubMed
Summary
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Adolescents with schizotypal personality disorder (SPD) exhibit more involuntary movements, suggesting early brain abnormalities linked to schizophrenia. This motor dysfunction may precede clinical schizophrenia symptoms.

Area of Science:

  • Neuroscience
  • Psychiatry
  • Developmental Psychology

Background:

  • Motor dysfunction is a recognized feature of schizophrenia, often preceding clinical diagnosis.
  • Involuntary movements, particularly in infancy, suggest potential subcortical brain abnormalities in schizophrenia.

Purpose of the Study:

  • To investigate spontaneous involuntary movements in adolescents with schizotypal personality disorder (SPD).
  • To explore the relationship between SPD, involuntary movements, and schizophrenia etiology.

Main Methods:

  • Systematic coding of videotaped diagnostic interviews to quantify involuntary movements.
  • Comparison of movement rates between adolescents with SPD, healthy controls, and adolescents with other personality disorders.
  • Measurement of salivary cortisol levels and correlation with involuntary movements.

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Main Results:

  • Adolescents with SPD displayed significantly more involuntary movements (head, trunk, upper limbs) than control groups.
  • No significant differences were found in the rate of voluntary movements across groups.
  • Salivary cortisol levels showed a positive correlation with the frequency of involuntary movements.

Conclusions:

  • Findings support a potential etiological link between SPD and schizophrenia, particularly concerning motor dysfunction.
  • Involuntary movements in SPD may indicate underlying subcortical brain abnormalities.
  • Results align with a neural diathesis-stress model for understanding schizophrenia development.