Travis, F. Arenander, A. (2006).
Cross-Sectional and Longitudinal Study of Effects of Transcendental Meditation Practice on Frontal Power Asymmetry and Frontal Coherence, International Journal of Neuroscience, 111(7)
Two studies investigated effects of Transcendental Meditation (TM) practice on mental health and on alpha power asymmetry, gamma power, and frontal coherence. Frontal coherence, but not power asymmetry, positively correlated with moral reasoning, emotional stability and inner orientation, and negatively correlated with anxiety. In a longitudinal TM study, gamma power and power asymmetry did not change during tasks or TM practice, while frontal coherence increased linearly during tasks, and as a step-function during TM-rising to a high level after 2-months TM practice. These data suggest that individuals quickly master TM practice. Long-term benefits are seen in activity.