Effects of Alzheimer's Disease on Visual Enumeration

Bibliographic Data

ID12440518
AuthorsElizabeth A Maylor (0000-0001-6351-3434, University of Warwick, corresponding author), Derrick G Watson (University of Warwick), Zacharias Müller (University of Warwick)
Year2005
Volume60
Issue3
PagesP129-P135
Publication date2005-05-01
Open AccessNo
TypeARTICLE
VenueThe Journals of Gerontology Series B (JOURNAL)
Journal identifiersISSN: 1079-5014 • E-ISSN: 1758-5368
PublisherOxford University Press (OUP) (PUBLISHER)
DOI10.1093/geronb/60.3.p129
PMID15860782
OpenAlexW2104287443
LanguageEN
Citations received1
References cited42

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

Alzheimer's disease · Audiology · Cognition · Cognitive impairment · Combinatorics · Disease · Enumeration · Mini–Mental State Examination · Numerosity adaptation effect · Pathology · Cognitive and developmental aspects of mathematical skills · Mathematics · Medicine · Neural and Behavioral Psychology Studies · Neuroscience · Psychology · Spatial Neglect and Hemispheric Dysfunction

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