Neurocomputational Dynamics of Cooperation

The purpose of this study is to understand brain function, how people make decisions when they interact with others, and how brain function and behavior relate to personality traits.

Online cohort inclusion criteria: * English fluency * US residency * Owner of a desktop or laptop computer * Adult aged 18-100 Online cohort exclusion criteria: * Participants who have participated in an earlier version of the study * Inability to consent * Self-reported history of neurological disorder or brain damage * Self-endorsed history of psychosis or mania Clinical cohort inclusion criteria: * Adult aged 20-60 years old * English fluency * Owner of a smartphone with celluar data Clinical cohort exclusion criteria: * Inability to consent * Self-reported history of neurological disorder or brain damage * Clinician-rated psychosis or mania in the last 6 months * Current intoxication or withdrawal * Estimated IQ \< 70 * fMRI safety concerns * Pregnancy * Lack of stable psychiatric treatment (e.g., medication dosage, therapy modality) for the previous two months Informant inclusion criteria: * Adult aged 18+ years old * English fluency * Owner of a smartphone with celluar data * Must have 4+ interactions/week with the participant for at least 6 months prior to study baseline Informant exclusion criteria: \- Lack of a smartphone with cellular data at study baseline