Researchers at the University of Wisconsin-Stout designed an experiment to test how quickly meditation could change people's brain patterns. 11 participants "were offered two half-hour sessions a week, and encouraged to practice as much as they could between sessions, but there wasn’t any particular requirement for how much they should practice." After five weeks, during which each person meditated for an average of seven hours, distinct changes in brain patterns emerged. More activity was measured in the left frontal lobe of the brain, an area often associated with positive emotion.
via bigthink.com