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Memory-scanning task performance in Alzheimer's disease
B Kerr1, M V Vitiello, M Calogero
1Department of Psychology, University of Washington, Seattle, USA.
Aging (Milan, Italy)
|February 5, 1999
Summary
Individuals with mild Alzheimer's Disease (AD) exhibit slower reaction times in memory tasks compared to healthy older adults. Despite differences in speed and variability, the memory scanning rate remained similar between groups.
Area of Science:
- Cognitive Neuroscience
- Neurology
- Psychology
Background:
- Alzheimer's Disease (AD) is a neurodegenerative disorder impacting memory and cognitive functions.
- Memory scanning tasks are crucial for assessing cognitive processing speed and efficiency.
Purpose of the Study:
- To investigate memory scanning performance in individuals with mild Alzheimer's Disease (AD) compared to healthy controls (NC).
- To analyze reaction times (RT) and their relationship with set size in both groups.
Main Methods:
- A varied-set Sternberg memory-scanning task was administered to mild AD patients (N=23) and NC individuals (N=38).
- Set sizes ranged from 1 to 4, with analysis of reaction times for both 'YES' and 'NO' responses.
Main Results:
- The AD group demonstrated significantly slower and more variable reaction times than the NC group.
- Reaction time differences were more pronounced for 'NO' responses compared to 'YES' responses.
- The linear relationship between RT and set size was less consistent in the AD group than in the NC group.
Conclusions:
- While mild AD affects overall reaction speed and response variability, the fundamental rate of memory scanning appears preserved.
- Findings contrast with some earlier studies, suggesting that larger sample sizes may reveal preserved scanning rates in mild AD.