1. T. Elbert and B. Rockstroh, Department of Psychology, University of Konstanz, D-78434 Konstanz, Germany.
2. C. Pantev and C. Wienbruch, Biomagnetism Center, University of Münster, D-48129 Münster, Germany.
3. E. Taub, Department of Psychology, University of Alabama at Birmingham, Birmingham, AL 35294, USA.