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Individual differences in cognitive decline in schizophrenia

G Goldstein1, D N Allen, D P van Kammen

  • 1VA Pittsburgh Healthcare System, Highland Drive Division, PA 15206-1287, USA.

The American Journal of Psychiatry
|August 12, 1998
PubMed
Summary
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Cognitively impaired schizophrenia patients show no age-related cognitive decline, unlike those with normal cognition. This suggests an earlier onset of cognitive deficits in severely impaired schizophrenia patients.

Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Psychology

Background:

  • Schizophrenia is often associated with cognitive impairments.
  • Age-related cognitive decline is a common concern in neurological and psychiatric disorders.

Purpose of the Study:

  • To investigate if cognitive decline in schizophrenia patients with severe cognitive impairment differs from those with normal cognitive function regarding age.
  • To compare age-related cognitive changes in schizophrenia patients with reference groups.

Main Methods:

  • Calculated correlation coefficients between age and Average Impairment Rating (AIR) in 77 schizophrenia patients.
  • Stratified schizophrenia patients into near-normal (N=51) and severely impaired (N=26) cognitive function groups.
  • Utilized reference groups: senile dementia (N=21) and non-schizophrenic patients (N=299).

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Main Results:

  • A significant correlation between age and AIR was observed in non-schizophrenic patients and near-normal schizophrenia patients.
  • No significant correlation between age and AIR was found in the severely cognitively impaired schizophrenia group.
  • A zero-order correlation was obtained for the severely impaired schizophrenia patients.

Conclusions:

  • Severely cognitively impaired schizophrenia patients lack the age-cognition correlation seen in schizophrenia patients with normal cognitive function.
  • This finding suggests that cognitive deficits may have an earlier onset in schizophrenia patients with substantial cognitive impairment.
  • The study highlights distinct patterns of cognitive aging in schizophrenia based on initial impairment levels.