Variability in Stroop task performance and functional activation among a small brain-injured group.

This study evaluated the effects of moderate to severe brain injury on cognitive task performance and cortical activation. Five participants completed a Stroop task while undergoing functional magnetic resonance imaging (fMRI) at two time points post- injury. Results revealed activation within regions typically activated during a Stroop task (the region of interest: ROI), though variability among participants was evident. Regions outside of the ROI were activated among all participants, to a greater degree than was present within the ROIs. This finding may indicate that recruitment of outside regions was necessary for successful task completion at both time points, and may suggest functional plasticity in cognitive task completion.