Cross-sectional and longitudinal study of effects of Transcendental Meditation practice on interhemispheric frontal asymmetry and frontal coherence
Authors: Travis F, Arenander A.
Published: International Journal of Neuroscience. 2006 Dec;116(12):1519-38.
Methods: Two studies investigated frontal alpha lateral asymmetry and frontal interhemispheric brain coherence during eyes-closed rest, Transcendental Meditation (TM) practice, and computerized reaction-time tasks. 
Results: In the first study, frontal brain coherence and lateralized asymmetry were higher in 13 Transcendental Meditation subjects than in 12 controls. In the second study (N = 14), a one-year longitudinal study, lateral asymmetry did not change in any condition. In contrast, frontal coherence increased linearly during computer tasks and eyes-closed rest, and as a step-function during Transcendental Meditation practice–rising to a high level after 2-months meditation practice. Coherence was more sensitive than lateral asymmetry to effects of Transcendental Meditation practice on stress and brain functioning.
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