The Ovsiankina Effect

What it is

The effect describes behaviour after an interruption. When people are stopped partway through an activity and later given the chance, they tend to pick it up again. Ghibellini and Meier pooled 21 publications that measured this and found a resumption rate of about 67 per cent, almost unchanged when Ovsiankina's own 1928 data were left out. Resumption was more likely when the interrupted task was attractive to the person doing it.

It is a sister to the Zeigarnik effect, which came from the same series of studies published in Psychologische Forschung in the 1920s. The Zeigarnik effect is a claim about memory, that interrupted tasks are recalled better than finished ones. The Ovsiankina effect is a claim about action.

In effect

The Ovsiankina effect is the better explanation for why an unfinished story or task keeps pulling people back. A television cliffhanger leaves a story interrupted, and an autoplay countdown removes the pause in which a viewer might decide to stop. A game level abandoned halfway, a half-completed form or a course left at lesson three all invite the same urge to resume.

Related work by E. J. Masicampo and Roy F. Baumeister in 2011 suggests the urge can be quietened. Unfinished goals produced intrusive thoughts during an unrelated task, and making a specific plan, saying how, when and where the goal would be met, removed them.

What it does not say

The Ovsiankina effect does not say that unfinished tasks are better remembered. The same 2025 meta-analysis found no memory advantage for interrupted tasks across 38 publications, which is why the memory claim usually attached to cliffhangers is not supported.

Nor does it say that everyone always goes back. A resumption rate of about two in three leaves a third who do not, and how attractive the task is makes a difference.

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