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Neural activation during response competition.

E Hazeltine1, R Poldrack, J D Gabrieli

  • 1NASA Ames Research Center, Moffett Field, CA 94305, USA.

Journal of Cognitive Neuroscience
|August 17, 2001
PubMed
Summary
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The flanker task reveals brain activity changes during response competition. Increased activity in frontal and parietal regions correlates with slower reaction times and cognitive control.

Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • The flanker task is a well-established paradigm for studying selective attention and response inhibition.
  • It allows for the manipulation of response competition while maintaining constant task demands.

Purpose of the Study:

  • To investigate the neural correlates of response competition using functional magnetic resonance imaging (fMRI).
  • To identify brain regions involved in processing conflicting response signals during the flanker task.

Main Methods:

  • Participants performed the flanker task while undergoing fMRI brain scanning.
  • Behavioral data (reaction times) and brain activity were recorded and analyzed.

Main Results:

  • Trials with conflicting flanker stimuli resulted in significantly slower reaction times compared to congruent trials.

Related Experiment Videos

  • fMRI data showed increased activity in the right ventrolateral prefrontal cortex, supplementary motor area, left superior parietal lobe, and left anterior parietal cortex during conflict trials.
  • These neural activations were not attributable to stimulus complexity or learned associations.

    • Conclusions:

    • The findings suggest distinct roles for frontal and posterior brain regions in cognitive control during response conflict.
    • Frontal activations are potentially linked to response inhibition mechanisms.
    • Posterior activations may reflect the engagement of neural representations of inappropriate responses.