This study involves a virtual screening visit, 7 in-office visits, and a virtual check-in call with a clinician. Participation will last approximately 3 weeks in total.
Participants will attend a baseline visit during which they will complete mood questionnaires and a gambling task. Participants will then receive five treatments of transcranial light therapy over one week. The first and last of these treatments will be administered while the participant is in an MRI scanner. At the first visit, participants will also receive a "sham" tPBM treatment, meaning that the device will simulate real treatment, but will not actually apply the near-infrared light. The check-in call will occur approximately 2-3 days after the final treatment visit. This will be a brief call with a study clinician to check-in on the participant's mental and physical health. The follow up visit will occur approximately one week after the final visit. Subjects will be asked to complete mood questionnaires and/or gambling tasks during the first and fifth treatment visits, as well as at the follow up visit.
