1. Department of Psychiatry, University of California, Irvine, Irvine, 2Molecular and Integrative Neurosciences Department, The Scripps Research Institute, La Jolla, CA,USA, 3Meditation Research Institute, Rishikesh, Uttarakhand, India, 4Institute of Neural Computation, University of California, San Diego, La Jolla, CA, USA 5CERCO, CNRS, Université Paul Sabatier, Toulouse, France