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The neural correlates and functional integration of cognitive control in a Stroop task
1Functional MRI Research Center, Columbia University, New York, NY 10032, USA. tegner@fmri.columbia.edu
Neuroimage
|January 4, 2005
Summary
Cognitive control during conflict adaptation involves distinct brain networks. Increased activity in frontal regions supports cognitive control, while decreased activity in frontal and parietal areas reflects reduced conflict.
Area of Science:
- Cognitive Neuroscience
- Neuroimaging
- Human Brain Function
Background:
- Cognitive task performance is influenced by preceding trials, a phenomenon known as conflict adaptation.
- Conflict adaptation, observed in tasks like the Stroop task, is attributed to cognitive control adjustments.
Purpose of the Study:
- To identify the neural mechanisms underlying cognitive control during conflict adaptation.
- To differentiate neural correlates of reduced conflict from those of heightened cognitive control.
Main Methods:
- Event-related functional magnetic resonance imaging (fMRI) was employed during a color-word Stroop task.
- Psychophysiological interaction analysis (PPI) was used to examine functional connectivity.
Main Results:
- Distinct fronto-parietal networks were identified for conflict detection and adaptation.
- Conflict adaptation correlated with increased activity in the left middle frontal gyrus (GFm) and superior frontal gyrus (GFs).
- Reduced conflict was associated with decreased activity in prefrontal and parietal cortices, with enhanced functional integration observed via PPI.
Conclusions:
- Cognitive control is implemented by medial and lateral prefrontal cortices.
- These prefrontal regions modulate activity in sensory and motor processing areas to facilitate task performance.
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