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.