Updating sensory versus task representations during task-switching

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Publication Details

Subtitle: Insights from cognitive brain potentials in humans
Author list: Barceló F
Publisher: Elsevier
Publication year: 2009
Volume number: 47
Issue number: 4
Start page: 1160
End page: 1172
Number of pages: 13
ISSN: 0028-3932
Languages: English-Great Britain (EN-GB)


Abstract

Task-cueing studies suggest that the updating of sensory and task representations both contribute to behavioral task-switch
costs [Forstmann, B. U., Brass, M., & Koch, I. (2007).
Methodological and empirical issues when dissociating cue-related from task-related processes in the explicit task-cuing procedure. Psychological Research, 71(4), 393-400]. Here we used transition cues to orthogonally manipulate Cue- and Task updating
(switches vs. repetitions), in order to identify distinct behavioral
indicators and event-related potentials (ERPs) associated with the
exogenous and endogenous control of task preparation and execution. Both Cue- and Task updating, as well as their interaction, yielded significant behavioral costs, and evoked distinct cue- and target-locked ERPs. Task-switches
enhanced cue-locked early P3 amplitudes (180-220 ms) over mid-central
scalp regions, whereas cue switches reduced a fronto-central negativity
(N2; 255-295 ms). In contrast, both cue- and task-switches
enhanced cue-locked late P3 amplitudes (300-340 ms; novelty P3) over
centro-parietal regions, supporting the hypothesis of a common neural
substrate for processing stimulus and task novelty [Barceló, F., Escera, C., Corral, M. J., & Perianez, J. A. (2006). Task switching
and novelty processing activate a common neural network for cognitive
control. Journal of Cognitive Neuroscience, 18(10), 1734-1748]. In the
target period, both cue- and task-switches
reduced target P3 activity (310-730 ms) with short cue-target intervals
only, suggesting that behavioral switch costs reflect the accrual of
various time-dependent control operations during task preparation and execution. We conclude that the cognitive control of task-switching seems to emerge from a dynamic interplay between exogenous and endogenous sources of information.


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Last updated on 2019-13-08 at 00:45