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Frontal lobe involvement in a task of time-based prospective memory.
Craig P McFarland1, Elizabeth L Glisky
1Department of Psychology, University of Arizona, Tucson, United States. cpm3@email.arizona.edu
Neuropsychologia
|April 29, 2009
Summary
Aging negatively impacts time-based prospective memory (PM), but frontal lobe (FL) function, not age itself, is the primary driver. High FL function preserves PM performance in older adults, similar to younger individuals.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Gerontology
Background:
- Time-based prospective memory (PM) declines with age, potentially due to reduced frontal lobe (FL) function.
- Medial temporal lobes (MTL) are considered secondary to PM, despite PM's retrospective elements.
Purpose of the Study:
- Investigate the roles of FL and MTL in time-based PM.
- Examine the involvement of clock monitoring, plan generation, and time estimation in PM.
- Determine if diminished FL function, rather than aging itself, causes PM deficits.
Main Methods:
- 32 older adults were grouped by FL and MTL function composite scores.
- Participants completed a time-based laboratory PM task.
- Performance was compared between groups and with 32 younger adults.
Main Results:
- High-FL participants showed better PM than low-FL participants, matching younger adults.
- High-MTL participants improved PM only when FL function was also high.
- FL function predicted clock monitoring, planning, and time estimation accuracy.
Conclusions:
- Diminished frontal lobe function, not aging per se, primarily impairs prospective memory in older adults.
- High frontal function is crucial for effective time-based PM and associated cognitive processes.
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