Resolved but not forgotten: Stroop conflict dredges up the past
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Summary
This study investigates the mechanisms underlying sequential modulations of conflict effects in the Stroop task, specifically addressing whether these modulations reflect adaptive executive control or are artifacts of stimulus frequency and repetition. Previous research has debated whether the reduced congruency effect following incongruent trials (the Gratton effect) results from dynamic control adjustments or from lower-level factors like feature repetition and display frequency. The authors aimed to independently manipulate these factors to determine if item-specific proportion congruency (ISPC) effects and sequential modulations persist when frequency and repetition confounds are controlled. The researchers employed a four-choice Stroop task with 106 participants, utilizing a design that held constant the marginal frequencies of individual stimulus features (colors and words) while manipulating the frequency of their conjunctions. Crucially, the design included neutral trials (words unrelated to color responses) to provide independent estimates of display frequency effects without the confounding influence of response congruency. This allowed the authors to separate the effects of feature repetition, display frequency/contingency, and sequential history. Data were analyzed by excluding trials with feature repetitions to isolate pure sequential effects and by comparing congruency effects against frequency effects measured on neutral trials. The results demonstrated that feature repetitions, display frequency, and sequential history all significantly influenced response times. However, no evidence for an ISPC effect was found; the differences in congruency effects attributed to item-specific proportion congruency were fully accounted for by the display frequency effects observed on neutral trials. This supports the view that contingency and frequency, rather than item-specific control processes, drive these patterns. Furthermore, sequential modulations of congruency effects remained significant even when repetitions were removed and marginal display frequencies were held constant. The congruency effect was largest following congruent trials and smallest following neutral trials, indicating that sequential modulations persist independent of repetition and frequency confounds. These findings suggest that while display frequency and contingency can explain ISPC effects, they do not account for all sequential modulations of conflict. The persistence of sequential effects under controlled conditions supports the existence of adaptive control mechanisms that adjust the weighting of relevant and irrelevant information based on recent conflict history. The study clarifies the debate by demonstrating that both lower-level stimulus properties and higher-level executive control contribute to performance in conflict tasks, but that ISPC effects are likely epiphenomena of frequency and contingency rather than evidence of feature-specific control.
Key finding
Display frequency and contingency effects fully account for the item-specific proportion congruency effect, while sequential modulations of congruency persist independently of these factors.
Methodology
lab_experiment
Sample size: 104
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 |
| clean | success | clean | — | — | 1 | 2026-06-04 |
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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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