Are you anxious in social situations? Do you fear meeting new people or public speaking? If so, you may be eligible to participate in a research study at CU Boulder. Participation involves using a mobile app over 10-14 days and completing an MRI scan. Participants will earn up to $90. 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.