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A failure of 'Pop-Out' in visual search tasks in dementia with Lewy Bodies as compared to Alzheimer's and Parkinson's disease

Lookup NU author(s): Francesca Cormack, Alastair Gray, Dr Clive Ballard, Dr Martin Tovee


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Objectives. The pattern of neural damage in dementia with Lewy Bodies (DLB) led us to hypothesize that patients with DLB would be particularly impaired on parallel ('pop-out') search tasks, relative to serial search tasks, and that this would serve to distinguish DLB from other forms of neurodegenerative disease, particularly Alzheimer's disease (AD). Method. To explore this possibility we tested four groups of observers (DLB, Alzheimer's Disease, Parkinson's Disease and age-matched controls) on parallel and serial search tasks, and a choice reaction time task. Results. The DLB participants performed in a quantitatively and qualitatively different manner to the other groups. As predicted, they were particularly impaired on the parallel search task relative to the other observer groups. Conclusions. This pattern of deficit may reflect damage in the occipital areas leading to deficits in figure-ground segregation, and can assist differential diagnosis of DLB from other patients groups such as AD. Copyright © 2004 John Wiley & Sons, Ltd.

Publication metadata

Author(s): Cormack F, Gray A, Ballard C, Tovee MJ

Publication type: Article

Publication status: Published

Journal: International Journal of Geriatric Psychiatry

Year: 2004

Volume: 19

Issue: 8

Pages: 763-772

Print publication date: 01/08/2004

ISSN (print): 0885-6230

ISSN (electronic): 1099-1166

Publisher: John Wiley & Sons, Inc.


DOI: 10.1002/gps.1159


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