What about the “ups and downs” in our daily life? The influence of affective instability on mental health

Abstract

Although affective instability is considered to be a crucial factor for mental disorders, research on affective instability and mental health is still rare. The aim of the present study was to investigate affective instability and mental health operationalized by the degree of psychological distress and life satisfaction. Using ecological momentary assessment, we investigated affective intensity and instability in a general population sample (n = 218). Psychological distress and life satisfaction were examined cross-sectionally and longitudinally. In general, we found that positive affect was more variable than negative affect. When we accounted for the overlap between variables, our findings demonstrated that besides the effects of intensity in negative affect and positive affect, higher positive affective instability was related to better concurrent mental health. Longitudinally, negative affective intensity was a decisive factor in the development of mental health. In sum, our findings revealed that affective instability was not dysfunctional per se. In fact, instability in positive affect seems to be important to achieve mental health.