…11 people were invited to take part in meditation training, while the other 10 were told they would be trained later. The 11 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, the researchers did an EEG on each person again. Each person had done, on average, about seven hours of training and practice. But even with that little meditation practice, their brain activity was different from the 10 people who hadn’t had training yet. People who had done the meditation training showed a greater proportion of activity in the left frontal region of the brain in response to subsequent attempts to meditate. Other research has found that this pattern of brain activity is associated with positive moods.
This is particularly interesting because the changes were seen after such a small amount of meditation. I think it’s also key that the meditators were not forced to meditate, just given the opportunity and simply encouraged.