Wednesday, November 5, 2008

Technical but Interesting Anyway

Here is a medical research article that is interesting although medically technical.

Original Article
Magnetic resonance imaging brain activation in first-episode bipolar mania during a response inhibition task
Stephen M. Strakowski, Caleb M. Adler, Michael A. Cerullo, James C. Eliassen, Martine Lamy, David E. Fleck, Jing-Huei Lee and Melissa P. DelBello
Division of Bipolar Disorders Research, Department of Psychiatry, and the Center for Imaging Research, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
Correspondence to Dr Stephen M. Strakowski, Department of Psychiatry, University of Cincinnati College of Medicine, 231 Albert Sabin Way (ML0559), PO Box 670559, Cincinnati, OH 45267-0559, USA. Email:
Copyright Journal compilation © 2008 Blackwell Publishing Asia Pty Ltd
bipolar disorder • first-episode mania • fMRI


Aims: Impulsivity is common in bipolar disorder, especially during mania. Understanding the functional neuroanatomy of response inhibition, one component of impulsivity, might clarify the neural substrate of bipolar disorder.

Methods: Sixteen DSM-IV first-episode, manic bipolar patients and 16 matched healthy subjects were examined during a first manic episode using functional magnetic resonance imaging while performing a response inhibition task. All subjects were studied using a 4.0 Tesla Varian Unity INOVA Whole Body MRI/MRS system. The response inhibition task was presented using non-ferromagnetic goggles, and task performance was recorded during scan acquisition. Imaging data were analysed using analysis of functional neuroimages. Group contrasts were made for the specific response inhibition measure.

Results: The groups performed the task similarly, although both demonstrated relatively poor rates of target response, but high rates of successful 'stops'. Despite similar behavioural results, the groups showed significantly different patterns of functional magnetic resonance imaging brain activation. Specifically, during response inhibition, the healthy subjects exhibited significantly greater activation in anterior and posterior cingulate, medial dorsal thalamus, middle temporal gyrus, and precuneus. The bipolar patients exhibited prefrontal activation (BA 10) that was not observed in healthy subjects.

Conclusions: Bipolar and healthy subjects exhibit different patterns of brain activation to response inhibition; these differences may reflect different functional neuroanatomic approaches to response inhibition between the two groups.

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