This functional magnetic resonance imaging protocol uses a face recognition activation task to ascertain how brain activation patterns differ depending on the subject's familiarity with, and emotional attachment to, the person depicted in the visual stimulus. In a series of studies, subjects will view unfamiliar and familiar (including personally familiar and famous) faces; mothers will view pictures of their own child and those of familiar and unfamiliar children; and bereaved and non-bereaved spouses will view pictures of their spouse, other family members, and unfamiliar people. The use of emotionally significant faces as activation stimuli may help to elucidate the neural circuitry underlying interpersonal attachment and psychological responses to loss.