Age-Related Changes in Electrophysiological and Neuropsychological Indices of Working Memory, Attention Control, and Cognitive Flexibility
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Summary
This study investigates the neural and cognitive mechanisms underlying age-related variability in working memory, attention control, and cognitive flexibility. Motivated by theories suggesting that aging deficits stem from impaired attentional focus and an inability to suppress irrelevant stimuli, the authors examine whether individual differences in these domains are linked to specific event-related potential (ERP) components. Specifically, they test if the parietal P300 (P3b), associated with maintaining mental representations, and the frontal P300 (P3a/novelty P3), associated with shifting attentional sets, correlate with performance on neuropsychological tests in both younger and older adults. The researchers recruited 20 younger adults (ages 20–28) and 38 older adults (ages 65–81), who underwent extensive screening for health and cognitive status. Participants completed a battery of neuropsychological tests, including the Operation-Span (OSPAN) task to assess working memory and attention control, and Raven’s Progressive Matrices (RPM) to measure fluid intelligence and cognitive flexibility. During an equal-probability choice reaction time task involving sequences of Xs and Os, ERPs were recorded from eight electrodes. Participants were stratified into high and low groups for OSPAN and RPM scores within each age group to analyze brain activity relative to cognitive performance. Results indicated that younger adults were significantly faster than older adults in reaction times. Crucially, the study found that high OSPAN scores predicted better tracking of stimulus sequences in both age groups, evidenced by smaller P3b amplitudes to sequential changes. This suggests that individuals with higher working memory capacity maintain more stable mental representations, requiring less updating. Conversely, participants with lower cognitive flexibility (low RPM scores) exhibited larger frontal P3a responses, indicating a greater reliance on attention-shifting mechanisms. These two phenomena—P3b modulation by working memory and P3a modulation by cognitive flexibility—did not interact, suggesting they reflect dissociable control mechanisms. Notably, these relationships were present in younger adults, implying that the brain mechanisms underlying individual differences in cognitive aging operate early in life. The findings support the view that working memory and cognitive flexibility are distinct but related aspects of executive function, mediated by different neural systems. The persistence of frontal P3 activity in older adults with low cognitive flexibility aligns with theories of reduced inhibitory control in aging. By demonstrating that these ERP-behavior correlations exist in young adults, the study suggests that variability in cognitive aging may reflect lifelong individual differences in attentional control mechanisms rather than solely age-related decline. This provides a neurophysiological basis for understanding why some older adults maintain high executive function while others experience significant deficits.
Key finding
Individuals with higher working memory capacity maintain better mental representations of stimulus sequences as indicated by smaller parietal P3b amplitudes, while those with lower cognitive flexibility exhibit larger frontal P3a responses, with both effects present in younger and older adults.
Methodology
lab_experiment
Sample size: 58
Provenance
The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via author_sweep_intake on 2026-05-28.
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | author_sweep | — | — | 2 | 2026-05-28 |
| archive | success | canonical_url | — | — | 1 | 2026-06-04 |
| extract | success | cached | — | — | 3 | 2026-06-10 |
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| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-04 |
| enrich | success | — | — | — | 1 | 2026-05-28 |
| promote | success | — | — | — | 1 | 2026-06-04 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 2 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 15 | 2026-06-11 |
| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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