The Zeigarnik Effect
An unfinished task keeps tugging at your attention until you finish it. Or until you write down exactly how, when and where you will. The second one turned out to work just as well.
The Zeigarnik effect is the pull an unfinished task keeps on your attention. Bluma Zeigarnik first reported it in 1927 as a memory edge for interrupted tasks.
That memory claim has aged badly. A 2025 meta-analysis by Romain Ghibellini and Beat Meier pooled 37 publications beyond the original and found interrupted and finished tasks were recalled about equally. What held up is the urge to go back to unfinished work.
E.J. Masicampo and Roy Baumeister (2011) found the release valve. Students named two errands they had not yet planned, then read the opening of a mystery novel. About two in three drifted off mid-reading. Among students who first wrote down how, when and where they would do each errand, one in three did. They were no more confident of finishing. The plan answered the question the mind kept asking.
A later study in the paper tied the relief to people who actually carried out their plans. "Deal with it later" does not count.
The nudge: Before you switch tasks, not only at day's end, write one line per open loop: the next action, the time, the place. "Send Priya the revised numbers, 9:30, at my desk."
Source: Masicampo & Baumeister, Consider it done! Plan making can eliminate the cognitive effects of unfulfilled goals, Journal of Personality and Social Psychology (2011); Ghibellini & Meier, Interruption, recall and resumption: a meta-analysis of the Zeigarnik and Ovsiankina effects, Humanities and Social Sciences Communications (2025)
