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Updated: May 23, 2026
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A Cognitive Paradigm to Investigate Interference in Working Memory by Distractions and Interruptions
Published on: July 16, 2015
Increased prospective memory interference in normal and pathological aging: different roles of motor and verbal
J L Gao1, R T F Cheung, Y S Chan
1Department of Medicine, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong.
Summary
Prospective memory (PM) performance is comparable in young and older adults but impaired in Alzheimer's disease (AD). The PM interference effect worsens with aging, with different underlying mechanisms in normal versus pathological aging.
Area of Science:
- Cognitive Neuroscience
- Neuropsychology
- Gerontology
Background:
- Prospective memory (PM) is crucial for daily functioning.
- Aging affects cognitive processes, including PM.
- Alzheimer's disease (AD) significantly impacts cognitive abilities.
Purpose of the Study:
- To investigate prospective memory (PM) performance across different age groups and in Alzheimer's disease (AD).
- To examine the PM interference effect in healthy young adults, non-demented older adults, and patients with mild AD.
- To identify the neuropsychological mechanisms underlying PM performance differences.
Main Methods:
- A laboratory-based event-based prospective memory (PM) task was administered.
- Participants included 41 healthy young adults, 40 non-demented older adults, and 26 patients with mild AD.
- Path analysis was used to explore mediating mechanisms.
Main Results:
- PM task performance was similar in young and non-demented older adults but impaired in AD patients.
- The PM interference effect showed a progressive increase from young adults to older adults to AD patients.
- Slow motor processing speed mediated PM interference in normal aging, while slow verbal speed mediated it in pathological aging.
Conclusions:
- Prospective memory (PM) is differentially affected in normal aging and Alzheimer's disease (AD).
- Distinct neuropsychological mechanisms, such as processing speed, underlie PM deficits in normal versus pathological aging.
- These findings highlight the importance of considering specific cognitive mechanisms when assessing aging-related memory changes.
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