ObservatoryYou finish reading a message, go back to the document you were writing, and for a while the writing is worse. You’re at the desk, but not fully there. Researchers have a name for this: attention residue.
Where the term comes from
The term was introduced by Sophie Leroy, then at the University of Minnesota, in a 2009 paper in Organizational Behavior and Human Decision Processes: “Why is it so hard to do my work? The challenge of attention residue when switching between work tasks.”
Her idea is simple. When you switch from Task A to Task B, some of your attention stays with A, especially if A was unfinished or you were under time pressure. That leftover attention is the residue, and it lowers your performance on B.
What the experiments found
Leroy ran two experiments with participants who worked on a first task and then moved to a second one.
- People who left the first task unfinished carried more residue into the second task than people who had finished it.
- Working under time pressure on the first task reduced residue, apparently because time pressure forces you to reach a stopping point and close the task in your mind.
- People with more residue did worse on the second task.
Two limits worth knowing: the participants were in a lab, and the tasks were short. How large the effect is in your own working day is something you’d have to measure for yourself.
What this means in practice
- Finish or park. Leroy’s second experiment found that reaching a clear stopping point on the first task reduced the residue carried into the next. If you must switch, get the first task to a point you can call done for now.
- Fewer, longer sessions beat many short ones. Every switch has a cost you don’t feel until you try to concentrate again.
- The switch you don’t notice still counts. A quick look at a notification is a switch.
That last one is why Observatory records a drift whenever you leave the app mid-session, and shows it to you rather than folding it into your focus time. After a few weeks your drift count and average drift length are your own attention-residue data, from your own work, not a lab.
Sources
- Leroy, S. (2009). Why is it so hard to do my work? The challenge of attention residue when switching between work tasks. Organizational Behavior and Human Decision Processes, 109(2), 168–181. Abstract
Observatory is a calm focus timer for iPhone that only counts real focus. Drifts and pauses are tracked, never added. How it measures focus.
