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Semantic priming in schizophrenia: systematic review and meta-analysis
The British Journal of Psychiatry : the Journal of Mental Science
|February 5, 2008
Summary
This meta-analysis found qualified support for increased semantic priming in patients with schizophrenia and thought disorder. However, the effect might be influenced by general reaction time slowing in schizophrenia.
Area of Science:
- Cognitive psychology
- Psychiatry
- Neuroscience
Background:
- Semantic priming is a key theory for understanding thought disorder in schizophrenia.
- Previous research on semantic priming in schizophrenia has yielded inconsistent results.
Purpose of the Study:
- To investigate semantic memory and priming in patients with schizophrenia, differentiating between those with and without thought disorder.
- To synthesize findings from multiple studies using meta-analysis.
Main Methods:
- Pooled data from 36 studies involving semantic priming tasks in patients with schizophrenia and healthy controls.
- Analyzed data from 18 studies comparing patients with thought disorder to controls.
- Included 13 studies comparing patients with and without thought disorder.
Main Results:
- No overall evidence for altered semantic priming in schizophrenia as a whole.
- Increased semantic priming was observed in patients with thought disorder compared to controls, but not compared to patients without thought disorder.
- Stimulus onset asynchrony (SOA) and general reaction time slowing influenced the effect size of priming in patients with thought disorder.
Conclusions:
- Meta-analysis supports increased semantic priming as a potential psychological abnormality linked to thought disorder in schizophrenia.
- The findings suggest that general slowing of reaction time in schizophrenia may be a confounding factor, requiring further investigation.
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