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Cingulate activation increases dynamically with response speed under stimulus unpredictability.

Britta Hahn1, Thomas J Ross, Elliot A Stein

  • 1Neuroimaging Research Branch, Intramural Research Program, National Institutes of Health/National Institute on Drug Abuse, Baltimore, MD 21224, USA. bhahn@intra.nida.nih.gov

Cerebral Cortex (New York, N.Y. : 1991)
|September 12, 2006
PubMed
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Analyzing brain activity using functional magnetic resonance imaging (fMRI), researchers found that the anterior cingulate and angular gyri are more active during faster reaction times when events are unpredictable, suggesting a role in attention.

Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Functional magnetic resonance imaging (fMRI) studies typically average brain activation across trials.
  • Inter-trial variability in performance is often treated as error, but may reflect genuine cognitive processes.

Purpose of the Study:

  • To investigate if trial-by-trial fluctuations in reaction time (RT) correlate with brain activation.
  • To identify brain regions involved in dynamic attentional regulation during unpredictable events.

Main Methods:

  • Participants performed a target detection task with predictable and unpredictable target locations.
  • Whole-brain fMRI analysis used individual trial RT as a linear regressor to identify activation variability.
  • Compared brain activity between predictable and unpredictable trial conditions.

Related Experiment Videos

Main Results:

  • The anterior cingulate, posterior cingulate, and left angular/superior temporal gyri showed increased activation with faster RTs specifically in unpredictable target location trials.
  • No significant RT-activation association was observed when target locations were predictable.
  • This suggests these regions dynamically regulate attention to unexpected stimuli.

Conclusions:

  • Inter-trial performance variability can reveal insights into spontaneous cognitive processes, such as stimulus-driven attention.
  • The cingulate and angular gyri play a role in adapting attention to unpredictable environmental events.
  • This approach offers a novel way to study elusive attentional phenomena using fMRI.