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Effects of methylphenidate on working memory in traumatic brain injury: a preliminary FMRI investigation
Mary R Newsome1, Randall S Scheibel, Paul J Seignourel
1Cognitive Neuroscience Laboratory, Department of Physical Medicine and Rehabilitation, Baylor College of Medicine, 1709 Dryden, Ste. 725, BCM635, Houston, TX, 77030, USA, mnewsome@bcm.edu.
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.
Insights
Methylphenidate may enhance cognitive control in traumatic brain injury (TBI) patients during working memory (WM) tasks. This preliminary study found reduced brain activation in key areas, suggesting increased processing efficiency with methylphenidate treatment.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Pharmacology
Background:
- Traumatic brain injury (TBI) often results in cognitive deficits, particularly in working memory (WM).
- Methylphenidate is a stimulant medication used to treat conditions affecting attention and executive functions.
- Understanding the neural mechanisms underlying WM deficits in TBI is crucial for developing effective interventions.
Purpose of the Study:
- To investigate the effects of methylphenidate on brain activation during a working memory task in patients with TBI.
- To assess whether methylphenidate influences processing efficiency in brain regions critical for cognitive control.
Main Methods:
- A double-blind, placebo-controlled study involving patients with TBI.
- Participants received either methylphenidate (15 mg twice daily) or placebo for one month.
- Functional magnetic resonance imaging (fMRI) was used to measure brain activation during an N-back task (faces as stimuli) at pre-treatment and post-treatment.
Main Results:
- Methylphenidate, compared to placebo, led to decreased brain activation in the anterior cingulate, thalamus, cuneus, and cerebellum during a high-load working memory condition (2-load vs. 0-load).
- Region of interest analysis confirmed reduced activation in the anterior cingulate cortex.
- These findings suggest enhanced processing efficiency in cognitive control networks.
Conclusions:
- Preliminary findings suggest methylphenidate may improve processing efficiency in cognitive control networks during working memory tasks in TBI patients.
- The observed reduction in brain activation may indicate more efficient neural processing.
- Further research with larger sample sizes is warranted to confirm these effects.
