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Updated: Jun 16, 2026
11:01
Examining the Characteristics of Episodic Memory using Event-related Potentials in Patients with Alzheimer's Disease
Published on: August 30, 2011
Dual task during encoding, maintenance, and retrieval in Alzheimer's disease
Sergio Della Sala1, Gianna Cocchini, Robert H Logie
1Department of Psychology, Centre for Cognitive Ageing and Cognitive Epidemiology, and Human Cognitive Neuroscience, University of Edinburgh, Edinburgh, UK.
Journal of Alzheimer'S Disease : JAD
|January 30, 2010
Summary
Alzheimer's disease (AD) patients exhibit significant dual task impairments, unlike healthy adults. This study reveals AD's memory deficits are particularly pronounced during encoding and retrieval when performing two tasks simultaneously.
Area of Science:
- Cognitive Neuroscience
- Neurology
- Psychology
Background:
- Healthy individuals show minimal dual task costs when performing tasks at individual ability levels.
- Alzheimer's disease (AD) patients exhibit dual task decrements, but the specific memory phase affected remains unclear.
Purpose of the Study:
- To investigate dual task effects on memory encoding, maintenance, and retrieval in Alzheimer's disease (AD) patients compared to healthy adults.
- To identify the specific cognitive functions underlying dual task deficits in AD.
Main Methods:
- Two experiments utilized digit recall and visuo-motor tracking tasks, with demands titrated to individual participant abilities.
- Experiment 1 examined dual task effects throughout encoding and retrieval, while Experiment 2 systematically analyzed effects during encoding, maintenance, or retrieval phases exclusively.
Main Results:
- Alzheimer's disease patients demonstrated significant dual task decrements, particularly during the encoding and retrieval phases of memory.
- These findings suggest a specific deficit in a cognitive function supporting simultaneous task performance in AD.
Conclusions:
- The cognitive impairment in Alzheimer's disease (AD) involves a reduced capacity for simultaneous cognitive processing, especially impacting memory encoding and retrieval.
- Dual task paradigms are valuable for elucidating the specific cognitive deficits associated with Alzheimer's disease.
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