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Action (verb) fluency in schizophrenia: Getting a grip on odd speech.
MedLine Citation:
PMID:  21109405     Owner:  NLM     Status:  Publisher    
BACKGROUND: Formal thought disorder (TD) is a key symptom of schizophrenia with a significant impact on interpersonal relationships. Current cognitive models emphasize disordered language functioning and abnormalities accessing semantic representations. The cortical mechanisms for language and motor function are closely linked, hence action-related language may be impaired in TD, yet existing studies have focussed exclusively on object (noun) rather than action (verb) semantics. METHOD: In order to examine this issue both action (verb) and traditional semantic (tools, fruits, musical instruments) and phonological (FAS) fluency tasks were completed by individuals with schizophrenia (N=53) and healthy controls (N=69). Fluency performance was measured as the total number of correct words generated in 60s. The Schizotypal Personality Questionnaire (SPQ) was used to index odd and disorganized speech, as well as positive and negative symptoms. RESULTS: Fluency on all tasks was impaired in schizophrenia, compared to controls, with a similar effect size. Within the schizophrenia group Odd Speech was correlated with poor fluency for actions, tools and musical instruments but not fruit or phonological fluency. These action-related fluency deficits were also correlated with Constricted Affect and Social Anxiety but not with Unusual Perceptions/Odd Beliefs. CONCLUSION: These results point to a unique connection and possible common aetiology between action fluency and odd speech in schizophrenia rather than a general impairment in language/executive functions common to fluency tasks. The findings provide the first evidence of a specific role of action-based language production deficits in TD together with a joint effect on social interaction skills.
Johanna C Badcock; Milan Dragović; Coleman Garrett; Assen Jablensky
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2010-11-23
Journal Detail:
Title:  Schizophrenia research     Volume:  -     ISSN:  1573-2509     ISO Abbreviation:  Schizophr. Res.     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8804207     Medline TA:  Schizophr Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Crown Copyright © 2010. Published by Elsevier B.V. All rights reserved.
School of Psychiatry and Clinical Neurosciences, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Perth, Australia; Centre for Clinical Research in Neuropsychiatry, Gascoyne House, John XXIII Avenue, Mt Claremont, WA 6010, Perth, Australia.
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