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Both processing speed and semantic memory organization predict verbal fluency in schizophrenia.

Sophia Vinogradov1, Jennifer Kirkland, John H Poole

  • 1Department of Psychiatry, University of California San Francisco and Department of Veterans Affairs Medical Center, 116C-SFVAMC, 4150 Clement Street, San Francisco, CA 94121, USA. Sophia@itsa.ucsf.edu

Schizophrenia Research
|November 5, 2002
PubMed
Summary
This summary is machine-generated.

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Schizophrenia patients exhibit reduced verbal fluency due to impaired lexical retrieval and semantic memory organization. These cognitive factors, independent of each other, contribute to difficulties in word production.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Psychiatry

Background:

  • Verbal fluency is often impaired in schizophrenia.
  • The underlying cognitive mechanisms contributing to this deficit are not fully understood.
  • Investigating lexical retrieval and semantic memory organization is crucial.

Purpose of the Study:

  • To examine the relationship between lexical retrieval, semantic memory organization, and verbal fluency in schizophrenia.
  • To determine the contribution of these cognitive factors to the restricted verbal output observed in schizophrenia.

Main Methods:

  • Assessed lexical retrieval efficiency using choice reaction time (RT) on a lexical decision task.
  • Measured semantic memory organization complexity via Pathfinder semantic network analysis.

Related Experiment Videos

  • Correlated these measures with categorical verbal fluency performance in 40 schizophrenia outpatients and 16 healthy controls.

    • Main Results:

    • In the schizophrenia group, RT and semantic network links were negatively correlated with verbal fluency.
    • These factors together accounted for 23% of the variance in fluency.
    • Lexical retrieval and semantic organization were statistically independent in contributing to fluency deficits.

    Conclusions:

    • Reduced verbal output in schizophrenia is linked to both impaired lexical retrieval and variations in semantic memory organization.
    • Semantic memory organization partly reflects general intelligence.
    • Schizophrenia patients may differ in the specific cognitive processes underlying their reduced verbal fluency.