What are task-sets: a single, integrated representation or a collection of multiple control representations?

Rangelov, Dragan, Toellner, Thomas, Mueller, Hermann J. and Zehetleitner, Michael (2013) What are task-sets: a single, integrated representation or a collection of multiple control representations?. Frontiers in Human Neuroscience, 7 . doi:10.3389/fnhum.2013.00524

Author Rangelov, Dragan
Toellner, Thomas
Mueller, Hermann J.
Zehetleitner, Michael
Title What are task-sets: a single, integrated representation or a collection of multiple control representations?
Journal name Frontiers in Human Neuroscience   Check publisher's open access policy
ISSN 1662-5161
Publication date 2013-09-03
Sub-type Article (original research)
DOI 10.3389/fnhum.2013.00524
Open Access Status DOI
Volume 7
Total pages 11
Place of publication Lausanne, Switzerland
Publisher Frontiers Research Foundation
Language eng
Abstract Performing two randomly alternating tasks typically results in higher reaction times (RTs) following a task switch, relative to a task repetition. These task switch costs (TSC) reflect processes of switching between control settings for different tasks. The present study investigated whether task sets operate as a single, integrated representation or as an agglomeration of relatively independent components. In a cued task switch paradigm, target detection (present/absent) and discrimination (blue/green/right-/left-tilted) tasks alternated randomly across trials. The target was either a color or an orientation singleton among homogeneous distractors. Across two trials, the task and target-defining dimension repeated or changed randomly. For task switch trials, agglomerated task sets predict a difference between dimension changes and repetitions: joint task and dimension switches require full task set reconfiguration, while dimension repetitions permit re-using some control settings from the previous trial. By contrast, integrated task sets always require full switches, predicting dimension repetition effects (DREs) to be absent across task switches. RT analyses showed significant DREs across task switches as well as repetitions supporting the notion of agglomerated task sets. Additionally, two event-related potentials (ERP) were analyzed: the Posterior-Contralateral-Negativity (PCN) indexing spatial selection dynamics, and the Sustained-Posterior-Contralateral-Negativity (SPCN) indexing post-selective perceptual/semantic analysis. Significant DREs across task switches were observed for both the PCN and SPCN components. Together, DREs across task switches for RTs and two functionally distinct ERP components suggest that re-using control settings across different tasks is possible. The results thus support the “agglomerated-task-set” hypothesis, and are inconsistent with “integrated task sets.”
Keyword Attentional selection
Executive control
Perceptual processing
Task sets
Task switching
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Brain Institute Publications
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Citation counts: TR Web of Science Citation Count  Cited 8 times in Thomson Reuters Web of Science Article | Citations
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