Equivalence of cognitive processes in brain imaging and behavioral studies: evidence from task switching
DOI: 10.1016/s1053-8119(03)00206-4
archive: archived pipeline: cataloged verified
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Summary
This study addresses a critical methodological concern in cognitive neuroscience: whether cognitive processes measured during functional magnetic resonance imaging (fMRI) are functionally equivalent to those measured in standard behavioral settings. The authors argue that the validity of fMRI conclusions depends on the assumption that the scanner environment does not alter the cognitive functions under investigation. Potential threats to this equivalence include the unfamiliar, noisy, and supine position of the scanner, which may alter spatial frames of reference, as well as technical adaptations like longer intertrial intervals. To test this, the researchers focused on task-switching, a paradigm sensitive to cognitive control processes, specifically examining whether the complex interactions predicted by theoretical models hold true across different testing environments. The experimental design involved three groups of participants who performed identical spatial judgment tasks (judging vertical or horizontal position of a stimulus) under strictly equivalent conditions, differing only in the testing environment. The groups were: a standard behavioral group (upright, silent lab), a simulated MRI group (supine on a stretcher with mirror viewing and simulated noise), and a real MRI group (inside an operating scanner). The task included manipulations of stimulus valence (bivalent vs. univalent) and cue-target intervals (100 ms vs. 2000 ms) to probe task-set reconfiguration. The study aimed to replicate a specific, nontrivial three-way interaction between trial type, cuing interval, and stimulus valence across all three groups, which serves as a robust test of functional equivalence. The results demonstrated that the predicted complex three-way interaction was replicated in all three groups, indicating that the underlying cognitive control processes—specifically the advance reconfiguration of task sets—were functionally equivalent regardless of the setting. However, there was a significant main effect of group on reaction times (RTs). Participants in the real MRI group were significantly slower (mean RT 586 ms) than those in the simulated MRI group (513 ms), who were slower than the standard behavioral group (452 ms). Crucially, this general slowing did not interact with any cognitive variables (trial type, valence, or cuing interval), nor did it affect error rates in a way that suggested a speed-accuracy trade-off. The authors ruled out perceptual or cognitive causes for the slowing, such as stimulus identification or response selection, because these processes showed no interaction with the group variable. The authors conclude that while cognitive control processes in task switching are functionally equivalent inside and outside the scanner, the fMRI environment induces a nonspecific general slowing of reaction times. This slowing is attributed to unspecific distracting factors affecting late motor processes, such as the supine position or noise, rather than early perceptual or cognitive stages. This finding has important methodological implications for cognitive neuroscience, suggesting that researchers must account for elevated baseline RTs in scanner studies, particularly in experiments using response deadlines or those sensitive to temporal dynamics, such as stimulus-response compatibility tasks. The study validates the use of fMRI for studying cognitive control but highlights the need to distinguish between cognitive effects and motoric delays caused by the scanning environment.
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.
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | OpenAlex-citations | — | — | 1 | 2026-06-17 |
| archive | success | semantic_scholar | — | — | 6 | 2026-06-25 |
| extract | success | pdftotext | — | — | 2 | 2026-06-26 |
| clean | success | clean | — | — | 1 | 2026-06-26 |
| chunk | success | chunk | — | — | 1 | 2026-06-26 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-26 |
| enrich | failed | — | — | — | 5 | 2026-07-05 |
| promote | success | — | — | — | 1 | 2026-06-17 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-25 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-26 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-25; verification: verified.
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