1. Department of Psychiatry, University of Wisconsin, Madison, WI 53706, USA.
2. Department of Psychology, University of Notre Dame, Notre Dame, IN 46556, USA.
3. Neuroscience Training Program, University of Wisconsin, Madison, WI 53706, USA.
4. Department of Psychology, University of Wisconsin, Madison, WI 53706, USA.
5. Coma Science Group, University of Liège, 4000 Liège, Belgium.