 Some of the subjects will be asked to undergo an MRI brain scan during that hospitalization. In the first part of the scan subjects will be asked to remain still for a few moments and try to relax with no special guidance. After that they will watch a series of pictures and movie clips with emotional valence. During the final part of the scan subjects will be asked again to remain still for a few moments. This meeting, when performed, will also last for about an hour. 