The Zeigarnik Effect

It began with a café anecdote: waiters remember unpaid orders perfectly and forget them the moment the bill is settled.

In the experiment, participants were given about twenty tasks and interrupted on half of them. Asked later what they had done, the interrupted tasks were recalled about twice as often.

The mind leaves an "still open" tag on unfinished business, which is why it surfaces at odd moments.

Famous, but replications are patchy. It is not as simple as "interrupted, therefore remembered"; it depends on how much you wanted to finish, how you were stopped, and more.

The everyday part survives, though. A message you meant to answer later sits in a corner of your head until you do. Most people know the feeling.

Treat the size of the effect with caution, and use the part you can feel: open things take up room.

It cuts both ways. For things you want to continue, stop on purpose mid-way — mid-sentence, or one rep before you are done. The open tag pulls you back next time.

For things you want to let go of, write them down with a date. The mind treats "scheduled" much like "done". What refuses to close is what has no date.

"To be continued", "one more to evolve", the unread badge. Plenty of things come along to leave open tags in you, so closing them yourself is a skill worth practising.