“Compared to a control group that underwent only relaxation training, brain scans of the students who meditated for a total of at least 11 hours during the month had slightly increased connections in the white matter that connects the anterior cingulate cortex to the rest of the brain; by some measures, these connections were also more robust.”

[ via http://arstechnica.com/science/news/2010/08/meditation-boosts-part-of-brain-where-add-addictions-reside.ars ]