Age-related changes in neural mechanisms of prospective memory
DOI: 10.3758/s13415-018-0617-1
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Summary
This study investigates the neural mechanisms underlying age-related changes in prospective memory (PM), the ability to remember and execute intentions in the future. While PM is critical for daily functioning in older adults, existing literature presents mixed findings regarding age-related decline. The authors aim to resolve this by testing the Dual Mechanisms of Control (DMC) framework and the Multiprocess Model of PM. Specifically, they examine whether age-related deficits are driven by impairments in proactive control (sustained attentional monitoring) while reactive control (spontaneous retrieval) remains relatively spared. The researchers conducted a functional MRI study with 47 younger adults and 41 older adults. Participants performed a semantic classification ongoing task while monitoring for PM targets under two conditions: Focal, where target features were processed as part of the ongoing task (encouraging spontaneous retrieval), and Non-focal, where targets required additional strategic monitoring. The experimental design allowed for the separation of sustained brain activity (associated with proactive control) and transient activity (associated with reactive control and retrieval). Analyses focused on the anterior prefrontal cortex (aPFC) and dorsal frontoparietal network for sustained activity, and the ventral parietal memory network for transient activity. Results indicated that older adults exhibited reduced PM-related sustained activity in the aPFC and dorsal frontoparietal network. This reduction was attributed to an age-related compensatory shift, characterized by increased non-specific sustained activation during control blocks rather than a failure to engage monitoring strategies. In contrast, transient PM-trial specific activity was observed in both age groups within the ventral parietal memory network, including the precuneus. However, older adults showed selectively reduced transient activity in the left posterior inferior parietal node during the Non-focal condition. These neural differences statistically mediated age-related declines in PM performance. Additionally, age-related changes in functional connectivity between the aPFC and precuneus were linked to these performance deficits. The findings support the DMC framework, suggesting that age-related PM declines are primarily due to neural mechanisms supporting proactive cognitive control, such as sustained attentional monitoring. Reactive control mechanisms, which rely on spontaneous retrieval and transient activation, appear relatively spared in healthy aging. This distinction helps reconcile previous conflicting behavioral findings by demonstrating that PM performance depends on the specific cognitive demands of the task, with older adults struggling more with tasks requiring sustained monitoring than those allowing for spontaneous retrieval.
Provenance
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | Crossref | — | — | 1 | 2026-06-18 |
| archive | success | canonical_url | — | — | 1 | 2026-06-25 |
| extract | success | pdftotext | — | — | 2 | 2026-06-26 |
| clean | success | clean | — | — | 1 | 2026-06-26 |
| chunk | success | chunk | — | — | 1 | 2026-06-26 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-26 |
| enrich | success | semantic_scholar | — | — | 4 | 2026-06-26 |
| promote | success | — | — | — | 1 | 2026-06-18 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-26 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-26 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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