Physically and mentally healthy adults are needed for a research study at CU Boulder that involves using a mobile app over 10-14 days and completing an MRI scan. Participants will earn up to $90 for completing the study. In order to participate, you must: * Be 18-40 years of age * Be right-handed * Own a smartphone * Qualify based on a short online survey and phone interview. If you are interested in participating, please contact us at theMOSTstudy@gmail.com.