Abstract
As part of a preliminary investigation on the effects of methylphenidate on brain activation during a working memory (WM) task in patients with traumatic brain injury (TBI), patients with TBI received 15 mg of methylphenidate (N = 4) or placebo (N = 5) twice a day for one month in a double-blind, placebo-controlled design. Brain activation was assessed at pre-treatment and on the final treatment day using functional magnetic resonance imaging (fMRI) with an N-back task using faces as stimuli. In a whole brain voxel-wise analysis, methylphenidate, compared to placebo, produced a decrease in brain activation for the 2-load minus 0-load contrast in the anterior cingulate, thalamus, cuneus and cerebellum, regions associated with WM performance. Further, an a priori region of interest analysis with small volume correction found reduced activation in the anterior cingulate. Although based on a small sample size, these preliminary findings suggest methylphenidate may increase processing efficiency associated with cognitive control during WM tasks in patients with TBI.
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Acknowledgment
This research was supported by grants NS-42772 and NS-21889 awarded to Harvey S. Levin. The Michael E. DeBakey Veterans’ Affairs Medical Center and the South Central Mental Illness Research, Education and Clinical Center (MIRECC) provided equipment and laboratory space used in the collection and analysis of imaging data. We express gratitude to Andrew Saykin, Erin Bigler, and two anonymous reviewers for helpful comments.
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Newsome, M.R., Scheibel, R.S., Seignourel, P.J. et al. Effects of Methylphenidate on Working Memory in Traumatic Brain Injury: A Preliminary fMRI Investigation. Brain Imaging and Behavior 3, 298–305 (2009). https://doi.org/10.1007/s11682-009-9072-5
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DOI: https://doi.org/10.1007/s11682-009-9072-5