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Age differences in brain activity related to unsuccessful declarative memory retrieval
Cheryl L Grady1, Marie St-Laurent2, Hana Burianová3
1Rotman Research Institute at Baycrest, 3560 Bathurst St, Toronto, Ontario, Canada M6A2E1; Departments of Psychiatry and Psychology, University of Toronto, Ontario, Canada M5S 3G3.
Brain Research
|December 27, 2014
Summary
Older adults show altered brain activity patterns during memory recall failures. The salience network (SLN) is involved in errors, but its function is less differentiated in older adults, impacting cognitive control.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Aging Research
Background:
- Memory recall declines with normal aging.
- Brain activity patterns during memory recall failures are not well understood.
- Understanding these patterns can reveal aging's impact on cognitive function.
Purpose of the Study:
- To investigate age differences in brain activity during memory retrieval failures.
- To identify brain regions engaged during unsuccessful memory attempts.
- To determine the impact of aging on functional brain activity related to memory errors.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used.
- Three memory retrieval tasks were employed: autobiographical (AM), episodic (EM), and semantic (SM).
- Brain activity and functional connectivity were analyzed in young and older adults during successful and failed memory retrieval.
Main Results:
- Both age groups showed increased salience network (SLN) activity during memory failures, similar to non-memory errors.
- Older adults exhibited reduced SLN activity during unsuccessful autobiographical memory recall compared to young adults.
- Older adults displayed weaker functional connectivity between SLN and prefrontal cortex, and less differentiated SLN connectivity across memory conditions.
Conclusions:
- The SLN is engaged during memory recall failures, potentially due to the salience of errors for behavioral adaptation.
- In older adults, altered SLN connectivity suggests impaired inter-network communication and reduced cognitive flexibility.
- These findings highlight age-related changes in brain networks supporting memory retrieval and error processing.
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