Why Life Moves Fast: Exploring the Mechanisms Behind Autobiographical Time Perception.

We investigate why individuals commonly perceive time as passing quickly when reflecting on past periods of their lives. A traditional cognitive account proposes that routine experienced during a period decreases the number of memorable events, making that period appear short in retrospect. A motivational account derived from self-determination theory proposes that a period remembered as lacking self-determined growth feels unsatisfying or wasted, and thus seems to pass quickly. Two exploratory studies (N = 999) did not consistently support these accounts, although in Study 2 remembered routine predicted faster perceived pace, as hypothesized. Contrary to our motivational account, remembered growth positively, rather than negatively, predicted pace. Interpreting this unexpected finding, we conducted two pre-registered studies (N = 965) exploring how satisfaction with, and nostalgic longing for, periods of growth contribute to the perception of time passing quickly. Our findings have implications for encouraging productive responses to the subjective pace of life.