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Route learning performance in Alzheimer disease patients
M M Cherrier1, M Mendez, K Perryman
1Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle 98195, USA. cherrier@u.washington.edu
Neuropsychiatry, Neuropsychology, and Behavioral Neurology
|August 22, 2001
Summary
Alzheimer disease (AD) patients struggle with route learning and spatial orientation. Poor spatial reasoning, not just memory, likely causes topographic disorientation in AD.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Gerontology
Background:
- Topographic disorientation is prevalent in Alzheimer disease (AD).
- Cognitive deficits underlying topographic disorientation in AD remain unclear.
Purpose of the Study:
- To evaluate route learning capabilities in Alzheimer disease (AD) patients using an objective measure.
- To investigate the cognitive underpinnings of topographic disorientation in AD.
Main Methods:
- A novel Route Learning Test (RLT) was administered to 16 AD patients and 19 healthy controls.
- Neuropsychological assessments covered visuospatial ability, incidental learning, spatial relations, and landmark recognition.
Main Results:
- AD patients demonstrated significantly poorer performance on the RLT compared to controls, despite similar basic visuospatial skills.
- Egocentric and allocentric orientation abilities were the strongest predictors of RLT performance in AD patients.
- AD patients excelled at landmark recognition but struggled with spatial layout recall and incidental environmental detail recognition.
Conclusions:
- Impaired spatial orientation and reasoning contribute to poor route learning in AD.
- Topographic disorientation in AD may stem from deficits in spatial orientation abilities.