The many faces of preparatory control in task switching: Reviewing a decade of fMRI research

Ruge, Hannes; Jamadar, Sharna D.; Zimmermann, Uta; Karayanidis, Frini · 2011 · OpenAlex-citations

DOI: 10.1002/hbm.21420

archive: archived pipeline: cataloged verified

Get this paper ↗ (DOI — opens at the source; we link to it, we don't host it)

Summary

This review examines the neural basis of preparatory control in task switching, specifically addressing the inconsistency in functional MRI (fMRI) findings regarding switch-related activation. While behavioral research establishes that advance preparation reduces switch costs, fMRI studies have produced heterogeneous results concerning the localization and existence of enhanced prefrontal and parietal activation during switch trials compared to repeat trials. The authors aim to resolve these discrepancies by evaluating methodological constraints and the multidimensional nature of task preparation. The review analyzes fMRI studies using cued task-switching paradigms with preparation intervals exceeding 500 ms. It focuses on three key questions: whether brain areas are exclusively activated on switch trials, whether areas show greater activation on switch versus repeat trials, and whether distinct areas handle prepared versus unprepared conditions. The authors critically assess methodological designs, including constant long cue-target intervals (CTIs), jittered CTIs, and partial-trial designs. They argue that these modifications, necessary to disentangle preparatory from target-related BOLD signals, may inadvertently alter preparatory strategies and temporal predictability, thereby affecting the observed neural patterns. The findings reveal that the variability in BOLD activation is driven by both methodological artifacts and the specific preparatory modes employed. The authors propose that preparatory control is not a unitary process but involves a hierarchical interplay between abstract goal activation and the resolution of competition within action or attentional sets. Crucially, the review argues that while abstract goal activation alone can reduce behavioral switch costs, it does not necessarily produce enhanced switch-related BOLD activation. Instead, enhanced activation in prepared conditions is associated with the advance resolution of competition within action or attentional sets. Consequently, the presence or absence of switch-related activation depends on which preparatory mode is engaged, which is modulated by experimental design variables such as task practice and trial proportions. The significance of this work lies in its reframing of preparatory control as a multidimensional process rather than a single neural mechanism. By distinguishing between proactive adjustments driven by goal representation versus those driven by action/attentional set resolution, the review explains why some studies fail to detect switch-related activation despite behavioral benefits. This distinction clarifies the relationship between neural activity and behavioral performance, suggesting that future research must account for the specific preparatory strategies induced by experimental designs to accurately map the neuroanatomical basis of cognitive flexibility.

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.

Summary generated by qwen3.6-27b-prismaquant on 2026-06-25; verification: verified.

Topics

Ranked by relevance to this paper. Hover a topic for its definition.

• task switching
• executive function