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Action (verb) fluency in schizophrenia: getting a grip on odd speech
Johanna C Badcock1, Milan Dragović, Coleman Garrett
1School of Psychiatry and Clinical Neurosciences, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Perth, Australia. johanna.badcock@uwa.edu.au
Schizophrenia Research
|November 27, 2010
Summary
Schizophrenia patients show impaired action-based language fluency, linked to odd speech and social difficulties. This suggests a specific deficit in producing action words contributes to thought disorder and social interaction challenges.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Psychology
Background:
- Formal thought disorder (TD) is a core symptom of schizophrenia impacting social interactions.
- Cognitive models suggest TD involves language and semantic access impairments.
- Existing research overlooks action (verb) semantics, focusing on object (noun) semantics.
Purpose of the Study:
- To investigate action (verb) semantic fluency in schizophrenia.
- To explore the relationship between action fluency, semantic fluency, and phonological fluency.
- To examine correlations between fluency deficits and schizophrenia symptoms.
Main Methods:
- Compared action and traditional semantic/phonological fluency in individuals with schizophrenia (N=53) and healthy controls (N=69).
- Assessed fluency by counting correct words generated within 60 seconds.
- Used the Schizotypal Personality Questionnaire (SPQ) to measure symptoms like odd speech and affect.
Main Results:
- Schizophrenia patients exhibited impaired fluency across all tasks compared to controls.
- Odd Speech correlated with reduced fluency in actions, tools, and musical instruments, but not fruit or phonological tasks.
- Action fluency deficits were associated with constricted affect and social anxiety.
Conclusions:
- Findings indicate a specific link between action fluency and odd speech in schizophrenia, suggesting a common origin.
- Action-based language production deficits may play a unique role in TD.
- These deficits appear to jointly affect social interaction skills in schizophrenia.
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