Response-Conflict Moderates the Cognitive Control of Episodic and Contextual Load in Older Adults
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Summary
This study investigates the specific components of cognitive control that decline during normal aging, addressing the complexity of defining age-related deficits in executive function. The authors aimed to disentangle three distinct types of cognitive load—contextual, episodic, and response-conflict—to determine if deficits in one area moderate performance in others, thereby revealing a hierarchical organization of cognitive control. The researchers employed a multifactorial task-switching paradigm modeled on Koechlin et al. (2003) with 24 healthy younger adults (mean age 24.2) and 24 healthy older adults (mean age 69.4). Participants performed vowel/consonant and lowercase/uppercase discriminations cued by stimulus color. The experimental design manipulated three variables: contextual load (single vs. dual task blocks), episodic load (fixed vs. variable color-to-task mapping across blocks), and response-conflict load (congruent vs. incongruent trials where stimulus features implied same or different motor responses). Performance was measured via accuracy and reaction time. Results indicated that older adults performed significantly worse than younger adults across all conditions. Crucially, the analysis revealed that response-conflict was a major moderator of age-related differences in both contextual and episodic load conditions. While younger adults showed significant interactions between contextual and episodic loads, older adults exhibited a significant interaction between episodic load and response-conflict, but not between contextual and episodic loads. This suggests that the ability to resolve response conflict influences how older adults manage higher-order contextual and episodic demands. Accuracy was found to be a more sensitive measure of these cognitive control effects than reaction time. The findings support a hierarchical model of cognitive control, suggesting that deficits in older adults are primarily rooted in the resolution of response conflict. Impairments in managing contextual and episodic loads appear to be derivative of this more basic deficit in response selection. This implies that age-related declines in complex executive functions may stem from a fundamental difficulty in managing conflicting motor responses, rather than independent failures in maintaining task sets or updating episodic rules.
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | Crossref | — | — | 1 | 2026-06-19 |
| archive | success | openalex | — | — | 5 | 2026-06-26 |
| extract | success | cached | — | — | 2 | 2026-06-26 |
| clean | success | clean | — | — | 1 | 2026-06-20 |
| chunk | success | chunk | — | — | 1 | 2026-06-20 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-20 |
| enrich | success | openalex | — | — | 1 | 2026-06-20 |
| promote | success | — | — | — | 1 | 2026-06-19 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-26 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-20 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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