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Experimental models of schizophrenia.

S R Kay1, R Sandyk

  • 1Department of Psychiatry, Albert Einstein College of Medicine/Montefiore Medical Center, Bronx, N.Y. 10461.

The International Journal of Neuroscience
|May 1, 1991
PubMed
Summary

Positive and negative syndromes in schizophrenia are stable, independent dimensions, not subtypes. Negative symptoms may stem from dopaminergic deficiency, while positive symptoms suggest increased dopamine activity.

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Area of Science:

  • Psychiatry
  • Neuroscience
  • Clinical Psychology

Background:

  • Schizophrenia exhibits heterogeneity, with Kraepelinian subtypes not reliably predicting treatment response.
  • The distinction between positive and negative syndromes offers a promising approach to understanding schizophrenia's clinical and neurobiological dimensions.

Purpose of the Study:

  • To review evidence supporting the positive and negative syndromes in schizophrenia using the Positive and Negative Syndrome Scale (PANSS).
  • To propose a hypothesis on the pathophysiology of positive and negative symptoms in schizophrenia.

Main Methods:

  • Review of investigations utilizing the Positive and Negative Syndrome Scale (PANSS).
  • Analysis of data correlating positive and negative syndromes with various schizophrenia-related factors.

Main Results:

  • Positive and negative syndromes are stable, independent dimensions, not exclusive subtypes, and unrelated to illness progression.
  • These syndromes differentially relate to premorbid adjustment, cognitive development, family history, neurochemistry, and treatment response.
  • Together with depression and excitement, they form the fundamental symptomatic components of schizophrenia.

Conclusions:

  • Negative symptoms may represent core pathology, potentially a form of parkinsonism with dopaminergic deficiency and increased cholinergic activity.
  • Positive symptoms might reflect compensatory dopaminergic hyperactivity, possibly linked to early-onset dopamine loss.
  • Pineal calcification, associated with perinatal injury, may contribute to negative symptoms and influence antipsychotic response.

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