Bluma Zeigarnik

Who they are

The paper was written at the Psychological Institute of the University of Berlin and published in Psychologische Forschung as part of a series of studies on action and emotion. This page records only what that paper states. Biography beyond the cited work is not given here.

Key papers

Das Behalten erledigter und unerledigter Handlungen (1927). Zeigarnik tested 164 people individually, students and teachers as well as children, and also ran two group experiments. Each person was given a run of short tasks. Some were allowed to finish; others were stopped partway and moved on. Afterwards, each person listed as many tasks as they could remember. On her measure, the interrupted tasks were recalled about 90 per cent better than the completed ones, close to twice as often. She explained the result as a kind of tension: starting a task creates a need to complete it, and the need stays active until the task is done.

Key ideas

Zeigarnik's idea was that an unfinished task keeps a hold on the mind. The idea has been used to explain television cliffhangers, serial podcasts and progress bars, including in Adam Alter's Irresistible.

The memory claim has not held up well. A 2025 meta-analysis by Romain Ghibellini and Beat Meier pooled 38 publications on memory for interrupted tasks and found no memory advantage. The authors judged Zeigarnik's original values inflated and suggested her result may have depended on conditions common in laboratories of the 1920s, such as experimenters with strong authority and participants deeply absorbed in their tasks. The same meta-analysis supported a related tendency, the Ovsiankina effect, in which people go back and finish interrupted tasks.

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