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Semantic context-processing deficit in thought-disordered schizophrenic patients: evidence from new semantic priming
Chrystel Besche-Richard1, Christine Passerieux
1Université de Bourgogne, Dijon, France. chrystel.besche@u.bourgogne.fr
Thought-disordered (TD) schizophrenic patients show semantic priming abnormalities, particularly when the proportion of related words is low (15%). Cognitive processing demands influence these semantic context processing deficits.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Psychiatry
Background:
- Semantic context processing deficits are common in thought-disordered (TD) schizophrenic patients.
- Lexical decision tasks with semantic priming reveal these cognitive impairments.
Purpose of the Study:
- To evaluate experimental conditions affecting semantic context processing in TD schizophrenic patients.
- To investigate how cognitive strategies are deployed by TD patients during semantic priming tasks.
Main Methods:
- Two double lexical decision tasks with sequential word presentation (SOA 500 ms) were used.
- Participants included 15 TD schizophrenic and 15 normal individuals.
- Experiments varied the proportion of related words (25% in Exp 1, 15% in Exp 2).
Main Results:
- No significant semantic priming differences between groups in Experiment 1 (25% related words).
- A significant reduction in semantic priming was observed in TD patients in Experiment 2 (15% related words).
- Results contrast with previous studies using implicit processing tasks.
Conclusions:
- Experimental variables, including cognitive processing demands and the proportion of related words, impact semantic priming abnormalities in TD schizophrenia.
- The findings highlight the sensitivity of semantic priming tasks to specific experimental manipulations in schizophrenia research.
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