Ever felt like the moods of the people around you affect your own mood? Psychologists have long been interested in the idea of such emotional “spillover”, especially in relationships. For example, research has shown that happiness is contagious, as are bad moods across a range of stressful situations. It seems intuitive that if we are living with someone who is depressed then our own mood could also be negatively affected.
Before getting into specific research on this topic, I should note that it is generally hard to disentangle the exact nature of the association between two people’s mental states, especially when they spend a lot of time together. Was Joan’s depression a reaction to being surrounded by John’s depressive, or were they both depressed all along? (Or is there no relationship whatsoever between their mental health statuses?). Bottom line: like many things, the only way to really know whether two individuals’ mental states spill over to one another is to look at both of their mental health status across time.