Verbal fluency deficits in Parkinson's disease: A meta-analysis

Henry, Julie D. and Crawford, John R. (2004) Verbal fluency deficits in Parkinson's disease: A meta-analysis. Journal of the International Neuropsychological Society, 10 4: 608-622. doi:10.1017/S1355617704104141

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Author Henry, Julie D.
Crawford, John R.
Title Verbal fluency deficits in Parkinson's disease: A meta-analysis
Journal name Journal of the International Neuropsychological Society   Check publisher's open access policy
ISSN 1355-6177
Publication date 2004-07-01
Year available 2004
Sub-type Article (original research)
DOI 10.1017/S1355617704104141
Open Access Status File (Publisher version)
Volume 10
Issue 4
Start page 608
End page 622
Total pages 15
Place of publication Cambridge, United Kingdom
Publisher Cambridge University Press
Language eng
Formatted abstract
A meta-analysis of 68 studies with a total of 4644 participants was conducted to investigate the sensitivity of tests of verbal fluency to the presence of Parkinson's disease (PD) relative to healthy controls. Both phonemic and semantic fluency were moderately impaired but neither deficit qualified as a differential deficit relative to verbal intelligence or psychomotor speed. However, PD patients were significantly more impaired on semantic relative to phonemic fluency (rs =.37 vs.33, respectively), and confrontation naming, a test of semantic memory that imposes only minimal demands upon cognitive speed and effortful retrieval, was associated with a deficit that was of a comparable magnitude to the deficits upon each of these types of fluency. Thus, the disorder appears to be associated with particular problems with semantic memory. Tests that impose heavy demands upon switching may also be disproportionately affected. Demented and non-demented PD patients differ quantitatively but not qualitatively in terms of the relative prominence of deficits on tests of phonemic and semantic fluency. However, patients with dementia of the Alzheimer's type and demented PD patients can be differentiated from one another by the relative magnitude of deficits upon these two measures.
Keyword Parkinson's
Semantic memory
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Psychology Publications
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Citation counts: TR Web of Science Citation Count  Cited 155 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 165 times in Scopus Article | Citations
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Created: Mon, 18 Apr 2011, 23:08:17 EST by Lucy O'Brien on behalf of School of Psychology