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Related Experiment Videos

Attenuated frontal activation in schizophrenia may be task dependent.

V A Curtis1, E T Bullmore, R G Morris

  • 1Department of Psychological Medicine, Institute of Psychiatry (King's College), London, UK. v.curtis@iop.kcl.ac.uk

Schizophrenia Research
|May 5, 1999
PubMed
Summary

Schizophrenia patients show reduced frontal brain activation during verbal fluency tasks, unlike semantic decision tasks. This suggests frontal deficits in schizophrenia depend on specific cognitive demands, not a fixed impairment.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychiatry

Background:

  • Schizophrenia is associated with cognitive deficits, including impaired executive functions.
  • Previous studies suggest altered prefrontal cortex (PFC) activity in schizophrenia during cognitive tasks.

Purpose of the Study:

  • To investigate the neural correlates of two distinct linguistic tasks in individuals with schizophrenia using functional magnetic resonance imaging (fMRI).
  • To determine if observed differences in brain activation are task-specific or reflect a general frontal dysfunction in schizophrenia.

Main Methods:

  • fMRI was employed to compare brain activity in five male schizophrenic patients and five healthy controls during two covert linguistic tasks: verbal fluency and semantic decision.
  • Tasks involved silent word generation (verbal fluency) or categorization (semantic decision) contrasted with rest conditions.

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  • Statistical analyses included ANCOVA to identify group differences and task-by-group interactions in brain activation.

    • Main Results:

    • Healthy controls exhibited prefrontal cortex activation during both tasks.
    • Schizophrenia patients showed significantly reduced activation in several prefrontal regions during the verbal fluency task compared to controls.
    • No significant group differences in activation were observed during the semantic decision task.
    • A significant interaction between group and task was found in the left inferior frontal gyrus, left dorsolateral prefrontal cortex, and supplementary motor area.

    Conclusions:

    • The findings indicate that reduced frontal activation in schizophrenia is not a global deficit but is dependent on the specific cognitive demands of the task.
    • Verbal fluency, requiring intrinsic verbal material generation, elicits differential frontal engagement in schizophrenia compared to semantic decision tasks.