Effects of Alzheimer's disease on visual enumeration
Maylor, Elizabeth A., Watson, Derrick G. and Muller, Zoe. (2005) Effects of Alzheimer's disease on visual enumeration. Journals of Gerontology, Series B: Psychological Sciences and Social Sciences, Vol.60 (No.3). P129-P135. ISSN 1079-5014Full text not available from this repository.
Official URL: http://dx.doi.org/10.1093/geronb/60.3.P129
Speeded enumeration of visual objects typically produces fast and accurate performance for up to 3 to 4 items (subitization) but slower and less accurate performance thereafter (counting). We investigated enumeration ability in patients with Alzheimer's disease (AD) and in age-matched controls. AD patients were slower overall than controls. The subitizing span was significantly reduced in AD patients compared with controls (2.3 vs 3.5 items) and counting rate was significantly slower (451 vs 349 ms/item). Error rates were similar in the two groups except at numerosity 3, when AD patients made errors but controls did not (consistent with their subitizing spans). Within the AD patient group, several aspects of performance correlated significantly with Mini-Mental State Examination scores. Together, the results provide a striking contrast with studies showing preservation of enumeration ability in normal aging.
|Item Type:||Journal Article|
|Subjects:||B Philosophy. Psychology. Religion > BF Psychology
R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
|Divisions:||Faculty of Science > Psychology|
|Library of Congress Subject Headings (LCSH):||Alzheimer's disease, Visual perception, Reaction time|
|Journal or Publication Title:||Journals of Gerontology, Series B: Psychological Sciences and Social Sciences|
|Publisher:||Gerontological Society of America|
|Number of Pages:||7|
|Funder:||Economic and Social Research Council (Great Britain) (ESRC)|
|Grant number:||R000239180 (ESRC)|
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