Think & Growth — Episode #74 · Attention Residue
Model: Attention Residue (Sophie Leroy, 2009; Leroy & Glomb, Organization Science, 2018) Theme: Work — the invisible tax you pay every time you switch tasks
Narration Script (full, 155 written words ≈ ~70s TTS)
[Hook — Cover] That task you just switched from? Part of your brain is still stuck on it.
[The Idea — Slide 1] Researchers call it attention residue. Sophie Leroy coined the term studying task switching. Like windows left open on an old computer, unfinished tasks keep running in the background.
[How It Works — Slide 2] Your brain can't process two tasks perfectly at once. Leroy says that's not cognitively possible. So when you switch before finishing, performance on the new task quietly suffers.
[Real-World Example — Slide 3] In four experiments, Leroy and Glomb tested a fix: the ready-to-resume plan. Planners were seventy-nine percent more likely to make the optimal decision. One minute of writing.
[How to Apply — Slide 4] When interrupted, pause. Write where you stopped, the next step, and what's left to solve. That tiny note gives your brain permission to let go and fully engage.
[Takeaway + CTA — Slides 5 + CTA] Don't just switch tasks. Close the loop first — one line is enough. That's attention residue. Follow Think and Growth — one mental model a day. I'm Peter. See you tomorrow.
Per-Segment Clip Text (subtitle-fit: ≤15 words each)
| # | Slide | Text | Words |
|---|---|---|---|
| 1 | cover | That task you just switched from? Part of your brain is still stuck on it. | 15 |
| 2 | slide-1 | Researchers call it attention residue. Sophie Leroy coined the term studying task switching. | 13 |
| 3 | slide-1 | Like windows left open on an old computer, unfinished tasks keep running in the background. | 15 |
| 4 | slide-2 | Your brain can't process two tasks perfectly at once. Leroy says that's not cognitively possible. | 15 |
| 5 | slide-2 | So when you switch before finishing, performance on the new task quietly suffers. | 13 |
| 6 | slide-3 | In four experiments, Leroy and Glomb tested a fix: the ready-to-resume plan. | 13 |
| 7 | slide-3 | Planners were seventy-nine percent more likely to make the optimal decision. One minute of writing. | 15 |
| 8 | slide-4 | When interrupted, pause. Write where you stopped, the next step, and what's left to solve. | 15 |
| 9 | slide-4 | That tiny note gives your brain permission to let go and fully engage. | 13 |
| 10 | slide-5 | Don't just switch tasks. Close the loop first — one line is enough. | 12 |
| 11 | cta | That's attention residue. Follow Think and Growth — one mental model a day. I'm Peter. See you tomorrow. | 17 |
Clip checklist: every content clip motion: "none"; CTA motion: "fade_out"; ALL clips subtitle: "none". 11 clips ≤ 20 cap. 155 written words ≤ 200 budget.
Attention Residue: Half Your Brain Is Still on the Last Task
It's Monday morning. You're forty minutes into the report that actually matters when a colleague pings you about a procurement question. It'll take two minutes, you figure, so you switch. You answer. You click back to the report. And then you sit there, rereading the same paragraph, feeling like your working memory has been unplugged and replugged into the wrong socket.
You didn't lose those two minutes. You lost something worse: you brought the procurement question with you.
Business professor Sophie Leroy has a name for this: attention residue. Her definition is surgical — when you leave one task for another, especially unfinished and under deadline pressure, part of your attention stays behind, "continuing to worry and think about the last work when you need to pivot fully to the new task." She first documented the effect in 2009 research, then mapped the fix with organizational psychologist Theresa Glomb of the University of Minnesota in a study published in Organization Science.
Leroy's own metaphor is an old computer: leave too many windows open and the whole machine slows down. "It's like Windows staying open in our brains," she told University of Washington News. "As I am still thinking about Task A while trying to do Task B, I don't have the cognitive capacity to process those two tasks at the same time and do a perfect job on both tasks." Her conclusion is blunt: "It's not cognitively possible."
This is not a niche problem. Research that Leroy and Glomb published through Harvard Business Review puts the average professional's interruption rate at roughly every 6 to 12 minutes. If residue is the tax on every switch, modern knowledge work is a taxable event machine. Each unanswered ping quietly converts your best cognitive hours into the shallower version of you.
What the evidence actually shows. Leroy and Glomb ran four studies. The first surveyed 202 working professionals about real interruptions on the job. In the lab studies, participants interrupted from Task A to Task B were still mentally rehearsing Task A — measurable through word-association tests — and their performance on Task B suffered for it. The last two studies (66 and 44 subjects) tested the antidote, with people reviewing résumés in a simulated hiring decision. The result: participants who wrote a quick plan before switching were 79% more likely to make the optimal choice — and recalled more of the information they'd just read.
The fix costs one minute. It's called the ready-to-resume plan, and it's almost embarrassingly simple. The moment you're interrupted — or know you must switch — jot down: where you stopped, the very next step, and what's left to solve. That's it. A single line of notes telling your brain, in writing, "this loop will be closed, here's the map back." Leroy and Glomb found the tiny ritual gives the mind cognitive closure — permission to release Task A and actually show up for Task B. In their studies, planners showed less residue, performed better on the interrupting task, and were far more likely to return and finish the original work.
One honest caveat, because this channel doesn't sell shortcuts. The published studies measured performance on the interrupting task — the one you switch to. Whether the plan also boosts the resumed Task A wasn't directly tested; Leroy calls that "a step for future research," though she sees no reason it wouldn't help. And a 79% lift in a structured résumé exercise won't transfer one-to-one to your chaotic Tuesday. The mechanism — closure reduces mental rehearsal — is the durable part. The exact number is the illustration, not the promise.
Your playbook, in three moves:
First, price the switch. Before you alt-tab, ask what Task B really needs from you. If it's a real 30-second answer, fine — but then budget 60 seconds for the closing note before you go. Interruptions are unavoidable; free interruptions are a choice.
Second, write the ready-to-resume line. Three slots, one minute: Where I stopped. Next step. What's left. Put it at the top of the Task A document so it's the first thing you see when you return. This is the highest-leverage minute in your workday, and it costs less than the coffee getting cold.
Third, batch the residue. When you can't avoid rapid-fire switching (some jobs are the switch), group the fragments: all the small tasks in one block, then one deliberate transition back to deep work — with its own resume-note. You can't eliminate context switches; you can stop paying full fare on every one.
The bigger lesson is about what "done" means. You don't need to finish Task A to stop it from haunting you — you need to close the loop, and closure is a piece of paper, not a completed project. The unfinished report stops screaming the moment your brain can see, in your own handwriting, exactly how it ends.
Don't just switch tasks. Close the loop first — one line is enough.
Think & Growth — Episode #74 · Theme: Work
Sources
- UW News, "Task interrupted: A plan for returning helps you move on" (Jan 16, 2018): https://www.washington.edu/news/2018/01/16/task-interrupted-a-plan-for-returning-helps-you-move-on/
- Lawyerist, "Combatting 'Attention Residue' When Faced with Interruptions" (Jul 25, 2025): https://lawyerist.com/news/combatting-attention-residue-when-faced-with-interruptions/
- Leroy & Glomb, "A Plan for Managing (Constant) Interruptions at Work," Harvard Business Review (2020): https://hbr.org/2020/06/a-plan-for-managing-constant-interruptions-at-work