Attention Residue: A Written Plan Reduced It in Controlled Experiments

Some of the students were handed a word puzzle with no solution.

Nobody told them. They worked at it for a few minutes, were told to stop, and were moved straight on to a second job: appraising job candidates from their résumés. Sophie Leroy, the organizational researcher running the experiment, wasn't interested in the puzzle. She wanted to know what was still happening in their heads once they moved on.

What she found was that students who got stuck on the impossible puzzle did worse at the second task than students who had finished a puzzle against the clock. Part of their attention had stayed behind. She named that leftover attention residue.

Reference: NoRotZone attention residue overview — task switching, cognitive offloading, and ready-to-resume planning

What attention residue is

When you switch from Task A to Task B, your attention doesn't move over cleanly. Some of it keeps working on A, so B gets less than you think you're giving it. Picture a browser tab still playing audio after you've clicked away. You aren't looking at it, but it's using the speaker.

You've probably felt it. You leave one meeting still replaying a comment, and the next one starts without you. A message lands mid-document and you reread the same line three times. This is the kind of thing the research was written to explain.

Leroy's 2009 paper ran two experiments, the first with 84 undergraduates, and the pattern was consistent: people found it hard to pull their attention off an unfinished task, and they performed worse on whatever came next.

Finishing helps, but only under a deadline

The obvious fix is to finish what you start. Leroy tested that too, and the answer was more awkward than you'd hope.

People who completed the first task under time pressure showed fewer signs of lingering thoughts and did better on the second task. People who completed it with no time pressure did not get the same release. The deadline group also reported the most confidence that they had really finished. Her explanation is closure: finishing against a tight deadline leaves you sure the job is done, so your attention is free to go.

That is a strange result to build a work week on, and a less useful one than it sounds. Plenty of tasks can't be finished before the next thing lands. Interruptions don't check your progress bar.

A plan beats a deadline

Leroy and Glomb picked up the problem in 2018, in four studies. They found that people who expected to return to an interrupted task under time pressure had a harder time switching, and showed more residue. Then they tested a fix called a ready-to-resume plan.

The plan is small. Before you switch, you briefly write down where you stopped, where you'll pick up, what problems are still open, and what you're parking for later. Leroy says even a minute's work will do.

In their experiments, people who wrote the plan showed less attention residue and did better on the task that interrupted them. Per the University of Washington's summary, they made better decisions and remembered more of the résumés they had just read.

To feel a forced switch first-hand, try Rule Shift, which changes the sorting rule on you mid-run. It trains the switch itself, not the leftover attention this article is about, but the clumsy first answer after a change is a decent place to notice the cost.

What the studies leave open

Treat this as a solid lab result, not a productivity law.

The tasks were short and artificial. The 2009 participants were undergraduates, and the two studies that tested the plan used students too. The researchers also didn't test whether the plan helps when you go back to the original task, so "you'll resume faster" is a reasonable guess, not a finding.

And nobody has handed you a number. These experiments compare conditions. They don't tell you how many minutes residue lasts, so be wary of any article that does.

Using it

When something pulls you off a task, take a minute before you leave:

1. Write the sentence that says where you stopped.
2. Write the first thing you'll do when you're back.
3. Note anything still open or deliberately parked.

You'll find plenty of other advice online: focus blocks, walks between meetings, a ritual to get started. Some of it is sensible. The ready-to-resume plan is the one fix covered here that was tested in lab experiments, so it's the one we can lean on.

The studies were about work interruptions, not phone notifications. The logic carries over to a group chat pinging while you're mid-document, but nobody here tested that.

Unfinished work follows you into whatever you do next. The fix the researchers tested costs a minute of writing.