MEG Unit, Brain Imaging Center, Goethe University, Frankfurt/Main, Germany.|Department of Psychiatry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.|Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany.|Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany.|Deutscher Wetterdienst, Section FE 12 - Data Assimilation, Offenbach/Main, Germany.|Department of Psychiatry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.|MEG Unit, Brain Imaging Center, Goethe University, Frankfurt/Main, Germany.