A Study to Explore Pharmacodynamic Effects of BIIB104 on Brain Circuitry in Healthy Participants

The primary objective of the study is to explore the pharmacodynamic (PD) effects of BIIB104 on brain circuitry associated with emotional processing in healthy participants. The secondary objectives of the study are to evaluate the safety and tolerability of BIIB104 in healthy participants; To further explore the PD effects of BIIB104 on brain circuitry associated with emotional processing in healthy participants; To explore the PD effects of BIIB104 on brain circuitry associated with working memory in healthy participants using the N-Back; To explore the PD effects of BIIB104 on regional cerebral blood flow (CBF) in healthy participants; To explore the PD effects of BIIB104 on brain circuitry during resting state in healthy participants.