Moving Bottleneck? Assessing the Dual-Task Costs Across a Range of Task Pairings
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Summary
This study investigates the psychological refractory period (PRP) effect, a phenomenon where performing two tasks simultaneously results in delayed response times for the second task, particularly when the stimulus onset asynchrony (SOA) is short. The research addresses a critical theoretical question regarding the central bottleneck theory: whether the duration of the bottleneck stage (response selection) is determined by the intrinsic properties of individual tasks or by the specific pairing of tasks. Previous models often assume that bottleneck duration is fixed per task, but this study tests whether dual-task costs vary systematically based on how tasks are combined. The authors employed a dual-task paradigm involving ten different task pairings derived from two input/output sets. Tasks varied by input modality (visual or auditory) and output modality (manual or vocal). Participants performed single-task, dual-task, and sequential blocks with SOAs of 50, 250, 800, and 1500 ms. The study analyzed the magnitude of the PRP effect (the difference in Task 2 reaction times between long and short SOAs) across these pairings. The analysis focused on three aspects: the relationship between Task 1 reaction time and PRP magnitude, the effect of holding Task 1 constant while varying Task 2, and the influence of stimulus/response overlap and pairing type (standard vs. non-standard) on interference. The results revealed little relationship between Task 1 reaction times and the magnitude of the PRP effect, suggesting that the bottleneck duration is not simply a function of Task 1’s processing speed. Crucially, when Task 1 was held constant, significant differences in PRP effects were observed depending on the paired Task 2, even when Task 2 stimuli were identical. This indicates that the PRP effect reflects online processing differences rather than task preparation or mixing costs. Furthermore, the study found that overlap in stimuli or responses did not systematically increase the PRP effect. Instead, the type of task pairing—specifically whether the pairing was "standard" (e.g., auditory-vocal, visual-manual) or "non-standard" (e.g., auditory-manual, visual-vocal)—played a major role in determining the magnitude of dual-task costs. Non-standard pairings generally exhibited larger PRP effects compared to standard ones. These findings challenge the assumption that bottleneck stage durations are determined solely by tasks considered in isolation. The results imply that the central bottleneck is not a static, amodal stage with fixed duration but is influenced by the specific configuration of the task pair. This suggests that dual-task interference is driven by the compatibility and nature of the task combination rather than just the individual complexity of each task. The study highlights the importance of considering task pairing dynamics in models of attention and cognitive control, offering a more nuanced understanding of how multiple tasks compete for processing resources.
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 | — | — | 7 | 2026-06-09 |
| extract | success | cached | — | — | 2 | 2026-06-10 |
| clean | success | clean | — | — | 1 | 2026-06-09 |
| chunk | success | chunk | — | — | 1 | 2026-06-09 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-09 |
| enrich | failed | — | — | — | 5 | 2026-07-02 |
| promote | success | — | — | — | 1 | 2026-06-04 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 8 | 2026-06-11 |
| verify | success | — | — | — | 1 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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