China trip on see adulthood. Zz Zeigarnik effect the tendency for interrupted, uncompleted tasks to be better remembered than completed tasks. Some theorists relate this phenomenon to certain gestalt principles of organization but at the level of higher mental processing (e.g., memory), rather than at the level of pure perception, [described in 1927 by Bluma Zeigarnik (1900-1988), Russian psychologist Zeitgeber n. a cue, such as day length, used to activate or time a biological rhythm. See entrainment. China trip 2016.