Reactive control processes contributing to residual switch cost and mixing cost across the adult lifespan
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Summary
This study investigates the cognitive mechanisms underlying residual switch and mixing costs in task-switching paradigms across the adult lifespan. While performance costs persist even after extensive practice and preparation (residual costs), it remains unclear whether these costs stem from interference at the level of stimulus processing or response processing. The authors specifically address why older adults exhibit disproportionately larger residual mixing costs compared to younger adults, hypothesizing that this reflects a strategic recruitment of reactive control to manage post-stimulus interference rather than a general decline in cognitive flexibility. The researchers re-analyzed event-related potential (ERP) data from a previous study (Karayanidis et al., 2011) involving 95 participants aged 18–80. Participants performed a cued-trials task-switching paradigm with a long preparation interval (1000 ms) to isolate residual costs. The analysis employed stimulus-locked and response-locked P3 components to distinguish between decision-related and post-decision processes, as well as stimulus-locked and response-locked lateralized readiness potentials (LRPs) to separate stimulus encoding from response programming. Additionally, evidence accumulation models (diffusion models) were used to estimate decision parameters (drift rate, response criterion) and non-decision time (Ter). The results indicate that residual mixing cost arises from the need to control interference at the level of stimulus processing, whereas residual switch cost involves both stimulus-level interference and a delay in response selection. Crucially, the disproportionate increase in residual mixing cost observed in older adults was associated with greater interference at the level of decision-response mapping and response programming for repeat trials in mixed-task blocks. Older adults maintained a high, conservative response criterion for both mixed-repeat and switch trials, unlike younger adults who adjusted criteria flexibly. This led to prolonged reaction times and increased ERP differentiation for mixed-repeat trials in older adults, suggesting they processed these trials similarly to switch trials. The findings suggest that older adults strategically recruit greater proactive and reactive control to overcome increased susceptibility to post-stimulus interference. The age-related increase in mixing cost is not merely a deficit in cognitive flexibility but reflects a compensatory strategy to manage reduced repetition benefits. By dissociating stimulus-level and response-level contributions, the study clarifies that residual costs are multifaceted, involving both perceptual interference and motor preparation delays, with aging specifically impacting the efficiency of response programming and decision mapping in mixed-task contexts.
Key finding
Residual mixing cost arises from stimulus-level interference control, whereas residual switch cost involves response selection delays, with older adults showing increased mixing costs due to greater interference at decision-response mapping and response programming stages.
Methodology
lab_experiment
Sample size: 95
Provenance
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| 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 |
| clean | success | clean | — | — | 1 | 2026-06-04 |
| chunk | success | chunk | — | — | 1 | 2026-06-04 |
| 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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