Methods
RECRUITMENT
We use data from two different cohorts of college students from the Social Health Impact of Network Effects (SHINE) Study which we refer to as Study 1 and Study 2. Details of recruitment, study design, and data analysis can be found in Supplement A. All research, methods, and study protocols were approved by the Human Subjects Electronic Research Application (HSERA) Institutional Review Board (IRB) at the University of Pennsylvania and were acknowledged by the Human Research Protection Office of the Department of Defense. All research, methods, and study protocols were conducted in accordance with the Human Subjects Institutional Review Board (IRB) at the University of Pennsylvania and the Human Research Protection Office of the Department of Defense. All participants provided informed consent before taking part in the study and were financially compensated. In Study 1, participants were compensated up to a total of $145. Compensation consisted of a $20 Amazon gift card to complete an online baseline survey; a $20 bonus Amazon gift card payment for at least 80% of the social group completing the survey; $50 for an in-person intervention training session, including an MRI scan session as part of a larger study (see Ref.