We usually think of optimism as personal. Emerging research suggests it may also be, in a sense, contagious — in ways that reach the brain.

The finding

In studies of couples, optimists and their partners tend to show better cognitive functioning, hinting that outlook travels through a shared environment — the routines, stress levels, sleep, and support a relationship creates (Levine et al., 2021). Connection is already one of the strongest predictors of long-term brain and body health; this suggests the people around you may shape your biology as much as your own habits do.

This article is for education and general wellbeing. It is not medical advice, diagnosis, or treatment, and does not replace your physician. mindspan is a wellness screen, not a diagnostic test.