Age-Based Differences in Task Switching Are Moderated by Executive Control Demands
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Summary
This study investigates how specific executive control demands moderate age-related differences in task switching performance. While older adults generally exhibit deficits in executive functions, the authors sought to determine which specific components of task switching—sensorimotor demand, stimulus-level interference, and updating/monitoring—are most sensitive to aging. The research was motivated by the need to understand the mechanisms underlying cognitive changes in the elderly, particularly given the ecological validity of task switching in daily life activities. The researchers employed a multifactorial experimental design with 91 clinically healthy adults (40 younger, 51 older). Participants performed a task-switching paradigm involving two simple choice tasks: classifying letters as vowels or consonants, and numbers as odd or even. Three aspects of executive control were manipulated between subjects. First, sensorimotor demand was varied by changing the number of distinct stimulus-response mappings (two-response vs. four-response conditions). Second, stimulus-level interference was introduced using flanker stimuli (irrelevant distractors surrounding the target). Third, updating/monitoring demands were manipulated by varying the frequency of task switches (10% vs. 50% switch frequency). Performance was measured using z-transformed reaction times (zRT) and accuracy rates, analyzing both switch costs (performance difference between switch and repeat trials) and mixing costs (performance difference between dual-task and single-task blocks). The results indicated that age-related deficits in task switching were not uniform across all executive demands. Older adults showed unique performance deficits in conditions involving high sensorimotor demand (four-response condition) and low switch frequency (10% condition), which required greater updating and monitoring. Specifically, a significant four-way interaction revealed that older adults committed the most errors and exhibited the longest latencies on switch trials when facing high motoric demands and infrequent, unexpected task transitions. Conversely, age differences were not observed for stimulus-level interference; older adults did not show a unique deficit in inhibiting distracting flankers compared to younger adults. Additionally, while mixing costs generally showed larger age differences than switch costs, the specific interaction of sensorimotor and updating demands was the primary driver of the observed age-related decline in switch performance. The findings suggest that task switching is particularly difficult for older adults when coupled with high sensorimotor complexity and infrequent, unpredictable transitions between task sets. This implies that age-related declines in executive function are not global but are specific to the combination of motoric mapping complexity and the cognitive load of maintaining and updating task sets. The lack of age-related deficits in interference control challenges process-specific accounts of aging that posit a unique decline in inhibitory control, suggesting instead that general processing speed or other mechanisms may account for interference effects. These results highlight the importance of considering specific executive control components when assessing cognitive aging and designing interventions for older adults.
Key finding
Older adults experience significantly greater task-switching costs than younger adults specifically under conditions of high sensorimotor demand and infrequent switching, but not under conditions of stimulus interference.
Methodology
lab_experiment
Sample size: 91
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 2026-05-27.
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | author_sweep | — | — | 2 | 2026-05-27 |
| archive | success | openalex | — | — | 5 | 2026-06-06 |
| extract | success | cached | — | — | 3 | 2026-06-10 |
| clean | success | clean | — | — | 1 | 2026-06-07 |
| chunk | success | chunk | — | — | 1 | 2026-06-07 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-07 |
| enrich | success | openalex | — | — | 5 | 2026-07-02 |
| 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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