Effects of reducing the number of candidate tasks in voluntary task switching
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Summary
This study investigates whether reducing the number of candidate tasks in voluntary task switching (VTS) facilitates performance, specifically by establishing "antagonistic constraints" that simplify task selection. The research was motivated by conflicting findings in the literature: while Kleinsorge and Scheil (2013) found that reducing tasks from four to two facilitated switches in cued task switching, Demanet and Liefooghe (2014) found no such facilitation in VTS. The authors hypothesized that if external cues and internally generated cues in VTS are functionally equivalent, reducing the task set should similarly facilitate switches in VTS. The experiment employed a VTS paradigm with 79 participants who chose from four tasks (magnitude, parity, font, color) or a restricted set of two tasks. The design included three timing conditions manipulating the execution response–prompt interval (ERPI) and indication response–stimulus interval (IRSI) to separate bottom-up interference from top-down preparation. Crucially, the study added a control condition with four candidate tasks, which was absent in previous VTS studies, to isolate the effect of task reduction. The results revealed a functional divergence between cued and voluntary task switching. Contrary to the hypothesis, reducing the number of candidate tasks did not facilitate task switches in VTS. Instead, task execution reaction times (RTs) increased for repetitions but decreased significantly only for "forced switch" trials (where both available tasks required a switch) compared to unrestricted switches. This selective advantage was independent of preparation intervals. Furthermore, restricting the task set caused a massive increase in task indication times, suggesting participants adopted a different strategy for voluntary selection. Error rates were generally low and showed no significant interaction with task choice that would support the antagonistic constraints hypothesis. The findings indicate that the mechanisms underlying task selection in VTS differ from those in cued task switching. The lack of facilitation in VTS suggests that internally generated cues do not support the establishment of antagonistic constraints in the same way external cues do. The observed speed-up in forced switches is attributed to a change in how participants perform voluntary switches rather than a cognitive shortcut in task selection. This study highlights the importance of distinguishing between top-down control processes and bottom-up factors in VTS and challenges the assumption of functional equivalence between explicit and implicit task cues.
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | Crossref | — | — | 1 | 2026-06-11 |
| archive | success | canonical_url | — | — | 1 | 2026-06-25 |
| extract | success | cached | — | — | 2 | 2026-06-25 |
| 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 | 2026-06-11 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-25 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-20 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-25; verification: verified.
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