Journal article
Alterations of visual search strategy in Alzheimer's disease and aging.
- Rösler A Department of Psychiatry, University Hospital, Basel, Switzerland.
- Mapstone ME
- Hays AK
- Mesulam MM
- Rademaker A
- Gitelman DR
- Weintraub S
- 2000-08-06
Published in:
- Neuropsychology. - 2000
Adult
Aged
Aging
Alzheimer Disease
Cues
Female
Fixation, Ocular
Humans
Male
Middle Aged
Neuropsychological Tests
Psychomotor Performance
Reaction Time
Saccades
Visual Perception
English
Visual search, characterized by eye fixation patterns, was examined in 8 patients with Alzheimer's disease (AD), 8 cognitively intact, age-matched individuals, and 8 young control participants as they searched for a number among a nonlinear array of letters on a large computer screen. Among the 3 groups, target detection accuracy differed and detection time increased linearly. There were more fixations, and fixation duration was significantly longer in the AD patients than in the other 2 groups. These factors contributed to the lengthening of target detection time. This qualitative difference in the architecture of visual search between AD and aging may reflect a specific deficit in the disengagement of visual spatial attention, a prolongation of saccade initiation, or inefficiency in planning a search strategy.
- Language
-
- English
- Open access status
- closed
- Identifiers
-
- DOI 10.1037//0894-4105.14.3.398
- PMID 10928743
- Persistent URL
- https://folia.unifr.ch/global/documents/164794
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