We are now enrolling participants in a study assessing brain development throughout adolescence. Participants will perform one hour of psychology tasks while we take images of their brain in an MRI scanner, followed by one hour of tasks outside of the scanner. All subjects must be between 14-17 years old, have no metal on/in their bodies the day of the scan (retainers are OK), and must have parental permission. Subjects will be paid $100 for their time. For more info, email costudies@gmail.com with "CU Adol EF" in the subject line.