Finding humor in hormones: Oxytocin promotes laughing and smiling.

Oxytocin (OT) is known for facilitating interpersonal interactions in favorable conditions. Humor, on the other hand, is an interpersonal phenomenon that reduces social distance. In this study, we investigated whether OT would increase laughing and smiling in a favorable environment. Therefore, participants were asked to view a brief video clip of a comedy television program in the presence of an ingroup member after administration of either OT or a placebo. Results demonstrated that participants in the OT condition exhibited more laughing and smiling behavior over the course of viewing the video compared to participants in the placebo condition. OT, however, neither affected self-reported affect nor perceived funniness of the clip. These findings indicate that OT, a hormone that can bolster attachment, also has the power to facilitate implicit social interactions by promoting visible and audible social signals, but does not affect the socially irrelevant inner cheerfulness.