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New Variations for Strategy Set-shifting in the Rat
09:45

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Published on: January 23, 2017

Two mechanisms for task switching in the prefrontal cortex.

Alexandre Hyafil1, Christopher Summerfield, Etienne Koechlin

  • 1Institut National de la Santé et de la Recherche Médicale, University Pierre and Marie Curie (Paris 6), Groupe Hospitalier Pitié-Salpêtrière, 75005 Paris, France.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|April 24, 2009
PubMed
Summary
This summary is machine-generated.

Task switching involves cognitive flexibility, with the anterior cingulate cortex (ACC) setting new task priorities and the dorsolateral prefrontal cortex (dlPFC) resolving interference from prior tasks.

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Executive Functions

Background:

  • Task switching reveals executive control system flexibility.
  • Anterior cingulate cortex (ACC) and dorsolateral prefrontal cortex (dlPFC) activity increases with task switches, but their roles are debated.

Purpose of the Study:

  • Investigate the neural mechanisms underlying task switching costs.
  • Differentiate the roles of ACC and dlPFC in cognitive flexibility.

Main Methods:

  • Subjects performed a hybrid spatial Stroop/task-switching paradigm.
  • Reaction times (RTs) and brain activity were measured during task switches.
  • Switch costs were analyzed based on trial congruency.

Main Results:

  • A general RT increase was observed on all switch trials.
  • Additional slowing occurred on incongruent-incongruent (iI) switch trials.
  • ACC activation correlated with general switch costs, while caudal dlPFC activation correlated with iI switch costs.

Conclusions:

  • The ACC configures priorities for new tasks.
  • The caudal dlPFC resolves interference from recently active, competing task sets.
  • Cognitive flexibility relies on both setting new priorities and overcoming interference.