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Correlation between left frontal phospholipids and Wisconsin Card Sort Test performance in schizophrenia

R F Deicken1, E L Merrin, T C Floyd

  • 1Magnetic Resonance Unit, Department of Veterans Affairs Medical Center, San Francisco, CA.

Schizophrenia Research
|January 1, 1995
PubMed
Summary

Schizophrenia patients show altered frontal lobe phospholipid metabolism, specifically lower phosphomonoester levels. This is linked to poorer performance on the Wisconsin Card Sort Test, indicating frontal lobe dysfunction.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Psychiatry

Background:

  • Schizophrenia is a complex mental disorder associated with cognitive deficits, particularly in executive functions.
  • Frontal lobe dysfunction is a common finding in schizophrenia, impacting neuropsychological performance.
  • Phospholipids play crucial roles in neuronal function and membrane integrity.

Purpose of the Study:

  • To investigate the relationship between frontal lobe phospholipid metabolism and executive function in schizophrenia.
  • To compare phospholipid measures and cognitive performance between patients with chronic schizophrenia and healthy controls.

Main Methods:

  • Utilized in vivo 31phosphorus magnetic resonance spectroscopic imaging (31P-MRSI) to measure frontal lobe phospholipid levels.
  • Assessed executive function using the Wisconsin Card Sort Test (WCST).

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  • Included 16 patients with chronic schizophrenia and 13 healthy controls.

    • Main Results:

    • Schizophrenic patients exhibited lower left frontal phosphomonoester (PhME) levels compared to controls.
    • Lower left frontal PhME levels in schizophrenics correlated with poorer WCST performance, including fewer categories achieved, lower percent conceptual level, and more total errors.
    • No significant correlations were found between frontal phospholipid measures and WCST performance in the control group.

    Conclusions:

    • Altered left frontal phospholipid metabolism, particularly reduced PhME, is associated with impaired executive functioning in schizophrenia.
    • These findings suggest a link between specific neurochemical alterations in the frontal lobe and deficits in neuropsychological measures of frontal lobe functioning.