VI
Mark học AIThe Zeigarnik effect · Bluma Zeigarnik, Kurt Lewin's group, Psychological Institute, Berlin
Do unfinished tasks stay in memory longer than finished ones? Today's answer: the "better memory" part is shaky, but unfinished tasks really do pull us back, and keep the mind busy until we give them a place.
The idea came from Kurt Lewin's theory of "tension": starting a task creates a need, and only finishing releases it.
At work this matters more than memory: unfinished tasks pull us back, even when we need to be doing something else.
The brain does not need the task done. It needs to know the task has a place and a time.
10 common claims about the Zeigarnik effect, checked against current research. Tap each row to see why.
This is the Ovsiankina effect (1928). A meta-analysis of 21 publications gives a resumption rate of about 67% (Ghibellini and Meier, 2025). The authors call it "a general tendency".
Leroy (2009) measured this in two groups of students (84 and 78) and called it "attention residue". Leroy and Glomb (2018) extended the idea across four studies. The effect is moderate and mostly measured in the lab.
The 1.9 comes from the first 32 people, 26 of whom recalled unfinished tasks better (Zeigarnik, 1927). The result is real in the paper, but modern statistical testing did not exist then, and the experimenter sat right next to each participant.
Already in the original: tired people scored 0.61 (they recalled finished tasks better), ambitious people far higher. Rosenzweig (1943) found that when the interruption feels like failure, people recall finished tasks better. Plausible, but these factors have not been tested enough to make rules.
Masicampo and Baumeister (2011), 6 studies, mostly with students. Clear results that fit research on if… then… plans, but no large independent replication yet.
Leroy and Glomb (2018), four studies, published in Organization Science. Worth trying because it costs almost nothing, but it comes from a single team so far.
Syrek et al. (2017): 59 employees, 357 matched Friday and Monday observations over 12 weeks. The link runs through negative rumination. It is a diary study: it shows a link, not proof of cause.
A meta-analysis of 38 publications using the most common measure gives a ratio of 0.99, essentially even (Ghibellini and Meier, 2025). Many reruns since the 1960s also found no difference.
A popular use in marketing and social media. The original experiment measured tasks you yourself left unfinished, not stories someone else left hanging. With a shaky memory effect, this is a double leap.
The Berlin café story is retold often, linked to Lewin. It is an illustrative anecdote, not data, and it is not part of the results in the 1927 paper. Fine to tell for fun, not to use as evidence.
Robustness 5/10. The famous name is attached to the weakest part (better memory), while the solid parts (wanting to resume, a mind kept busy by open tasks) are rarely told. The office lesson still works, because it rests on the solid part.
Ghibellini and Meier (2025) suggest a few reasons. Experiments in the 1920s were often one to one, the experimenter had authority, and participants (often students or colleagues) were deeply involved in the tasks. A task has to matter to the person before an interruption leaves it "hanging".
They also split results by the atmosphere of the experiment: in a relaxed setting the ratio was 1.07; in an achievement, test-like setting only 0.88. When an interruption feels like failure, people may prefer to forget the task. That fits Rosenzweig (1943).
The broader lesson: a catchy label ("the Zeigarnik effect") can outlive its data. The less famous part, Ovsiankina's, is the part that holds up.
Unfinished tasks will pull you back and take up a corner of your mind. Don't fight that, use it: stop in the right place, and write things down so your mind can let go.
Every number in the article, the Facebook images and the captions comes from the studies below.