 Testing on the second day will include the following: an MRI scan, which will take pictures of the brain both while participants are resting and while they are performing certain tasks; more neuropsychological testing similar to that from the day before; and questionnaires about emotional and social experiences. A family member will also be asked to fill out a questionnaire about the participant. On 2 other days, participants will be asked to collect saliva samples while at their homes and send the samples to the study researchers. In addition, the researchers will keep in contact with participants in case any follow-up is needed over the next few years. 