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Related Experiment Videos

Abnormal FMRI brain activation in euthymic bipolar disorder patients during a counting Stroop interference task.

Stephen M Strakowski1, Caleb M Adler, Scott K Holland

  • 1Center for Imaging Research, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0583, USA. stephen.strakowski@uc.edu

The American Journal of Psychiatry
|September 2, 2005
PubMed
Summary

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Euthymic bipolar disorder patients show impaired cognitive task performance and distinct brain activation patterns compared to healthy individuals. These neural differences persist regardless of medication status, suggesting underlying neurophysiological changes.

Area of Science:

  • Neuroscience
  • Psychiatry
  • Cognitive Science

Background:

  • Bipolar disorder involves mood disturbances and persistent cognitive impairments, even during euthymic periods.
  • Neuroimaging and cognitive tasks offer insights into the neurophysiology of bipolar disorder.

Purpose of the Study:

  • To investigate neurophysiological differences in euthymic bipolar disorder patients using functional magnetic resonance imaging (fMRI).
  • To correlate cognitive task performance with brain activation patterns in bipolar patients versus healthy controls.

Main Methods:

  • Sixteen euthymic bipolar disorder patients and 16 healthy controls performed a counting Stroop interference task during fMRI.
  • Brain activation patterns were analyzed and correlated with task performance.
  • The influence of medication on brain activation was assessed.

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Main Results:

  • Bipolar patients demonstrated poorer performance on the Stroop task compared to healthy subjects.
  • Significant differences in brain activation patterns were observed during the interference task.
  • Healthy subjects showed activation in temporal cortex, middle frontal gyrus, putamen, and cerebellum; bipolar subjects showed greater activation in medial occipital cortex.
  • Medication status did not explain these regional activation differences, though it influenced anterior cingulate and dorsolateral prefrontal cortex activation.

Conclusions:

  • Euthymic bipolar disorder patients exhibit altered brain activation in regions critical for interference tasks, potentially explaining their cognitive deficits.
  • These observed neural differences are not attributable to medication but may be modulated by it.