What is the Zeigarnik effect?
The Zeigarnik effect is the finding that people tend to recall interrupted tasks better than completed ones. Bluma Zeigarnik, a student of Kurt Lewin in Berlin, published it as her doctoral research in 1927.
According to the often-told story, Lewin noticed that a waiter remembered complicated unpaid orders perfectly but forgot them as soon as the bill was settled.
- Discovered by
- Bluma Zeigarnik (1927, Kurt Lewin’s lab)
- Core finding
- Interrupted tasks are recalled better than finished ones
- Explanation
- An unfinished goal leaves a "tension system" active (Lewin’s field theory)
- Related effect
- Ovsiankina effect, the urge to resume interrupted tasks
The 1927 experiment
- Participants worked through roughly 20 short tasks such as puzzles, stringing beads and arithmetic.
- Half the tasks were allowed to finish; the other half were stopped midway.
- Asked later to list the tasks, participants recalled the interrupted ones about 1.9 times as often.
In Lewin’s theory, starting a task creates a state of tension that is released only when the goal is reached. Unreleased tension keeps the task active in memory.
The Ovsiankina effect
Maria Ovsiankina, also in Lewin’s lab, showed in 1928 that when given a free moment, most people spontaneously go back to finish interrupted tasks. The Zeigarnik effect concerns memory; the Ovsiankina effect concerns behavior.
Replications are mixed. A 2025 meta-analysis found no consistent memory advantage for unfinished tasks, but a reliable tendency to resume them.
Everyday uses
| Area | Example |
|---|---|
| TV and streaming | Cliffhangers that make you start the next episode |
| Marketing and apps | Progress bars and "complete your profile" prompts |
| Studying | Stopping partway through a problem makes it easier to restart |
| Writing | Ending a session mid-sentence (a trick attributed to Hemingway) to restart easily |
| Procrastination | Committing to "just five minutes" gets a task started, and the urge to finish takes over |
Turning off the mental to-do list
Unfinished tasks can also intrude at bedtime or during focus time. Masicampo and Baumeister (2011) found that making a specific plan for an unfinished goal, saying when, where and how you will do it, sharply reduced intrusive thoughts even though the task was not done.
- Write down everything that is nagging you.
- For each item, decide the first concrete action and when you will do it ("Tomorrow at 9, outline the report").
- Treat the item as handled for now and return to the task in front of you.
For more on how learning and motivation work, see learning theories and metacognition.
Frequently asked questions
- What is an example of the Zeigarnik effect?
- Thinking about a show that ended on a cliffhanger, or a half-finished assignment that keeps popping into your head.
- How can I use the Zeigarnik effect to study?
- End each session by starting the next problem or section, so you have an easy, slightly unfinished place to pick up.
- Is the Zeigarnik effect real?
- The memory advantage has not replicated consistently, but people do reliably feel pulled to resume interrupted tasks.
References
- Zeigarnik, B. (1927). Das Behalten erledigter und unerledigter Handlungen. Psychologische Forschung, 9, 1–85.
- Ovsiankina, M. (1928). Die Wiederaufnahme unterbrochener Handlungen. Psychologische Forschung, 11, 302–379.
- Masicampo, E. J., & Baumeister, R. F. (2011). Consider it done! Plan making can eliminate the cognitive effects of unfulfilled goals. Journal of Personality and Social Psychology, 101(4), 667–683.
- Ghibellini, R., & Meier, B. (2025). Interruption, recall and resumption: A meta-analysis of the Zeigarnik and Ovsiankina effects. Humanities and Social Sciences Communications, 12. (doi.org/10.1057/s41599-025-05000-w)