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Related Experiment Videos

Functional connectivity during Stroop task performance.

Ben J Harrison1, Marnie Shaw, Murat Yücel

  • 1Brain Sciences Institute, Swinburne University of Technology, Melbourne, Australia. bharrison@bsi.swin.edu.au

Neuroimage
|December 14, 2004
PubMed
Summary
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Practice improves cognitive control during the Stroop task by altering brain networks. Functional connectivity changes in the cingulo-frontal system and ventral visual stream reflect enhanced task performance and reduced interference.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Brain Imaging

Background:

  • The Stroop color-word task is a standard measure of selective attention and cognitive control.
  • Previous studies using PET and fMRI have implicated various brain regions in Stroop task performance.
  • Understanding the dynamic changes in functional brain connectivity with practice is crucial for elucidating cognitive control mechanisms.

Purpose of the Study:

  • To investigate practice-dependent changes in functional connectivity of regional cerebral blood flow (rCBF) during an extended Stroop color-word paradigm.
  • To identify distinct neural networks associated with task learning and sustained cognitive control.
  • To explore the role of anterior cingulate and prefrontal cortices in implementing cognitive control.

Main Methods:

Related Experiment Videos

  • Utilized covariance-based multivariate analysis on H2(15)O PET scans from healthy subjects performing a practice-extended Stroop task.
  • Presented color-word congruent and incongruent conditions across multiple trials.
  • Employed cross-validation resampling and correction for random subject effects to identify reproducible canonical eigenimages (CE).

Main Results:

  • Identified two reproducible canonical eigenimages (CE) representing distinct patterns of covarying rCBF.
  • The first CE showed practice-dependent changes in the cingulo-frontal system and ventral visual stream, correlating with improved performance and reduced word reading interference.
  • The second CE revealed consistent Stroop interference effects in dorsal, ventral prefrontal, and frontopolar cortices, indicating sustained attentional control.

Conclusions:

  • Practice-related functional connectivity changes in specific brain networks facilitate cognitive control during the Stroop task.
  • The findings support theoretical models emphasizing the role of practice in the development of Stroop phenomena.
  • The study provides insights into the neural basis of cognitive control mediated by anterior cingulate and prefrontal cortical networks.