Emotional Inertia

Emotional inertia is a construct used in emotion research to describe the degree to which a person's emotional state at one point in time predicts, and resists changing away from, their emotional state a short time afterward, so that a person with high emotional inertia tends to remain in roughly the same emotional state for an extended stretch of time largely regardless of what is actually happening in their immediate surroundings, while a person with low emotional inertia shows emotional states that shift more readily and responsively as circumstances change. The construct has been developed and measured primarily through ecological momentary assessment research, a method that repeatedly samples a person's emotional state at many points across ordinary daily life rather than relying on a single retrospective report, with the psychologist Peter Kuppens among the researchers most closely associated with this line of work. Research using this approach has consistently found that higher emotional inertia, particularly with respect to negative emotional states, is associated with poorer overall psychological adjustment, and the construct has been proposed as a meaningful marker of vulnerability to depression, since a slow-moving, sticky pattern of negative emotion over time is understood to reflect reduced flexibility in a person's underlying emotion regulation processes, rather than simply reflecting how negative that person's average mood happens to be.