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The Interstitial Journal blog · Built on evidence, not hype

Attention Residue and the Evidence-Based Case for Interstitial Journaling

When you jump from one task to the next, a piece of your attention tends to stay behind. Researchers call this attention residue, and it's one of the better-documented reasons a quick context switch leaves you feeling foggy on whatever comes next. There's also a single, specific intervention with direct experimental support — a brief note about where you left off and what's next. That note is the evidence-backed heart of interstitial journaling. Everything else, we grade against the evidence, because this practice as a whole has not been formally trialed.

By comun.ai · 6 June 2026 · ~6 min read

What attention residue actually is

The term comes from organizational psychologist Sophie Leroy, who introduced and tested it in a 2009 paper with a relatable title: Why is it so hard to do my work?¹ Across a series of experiments, she found that when people switched between tasks, part of their attention stayed with the previous task instead of fully transferring to the new one — and their performance on the new task suffered until that residue cleared.¹

One of her more counter-intuitive findings: simply finishing a task before switching wasn't enough to clear the residue. What helped people disengage was a sense of time pressure while wrapping up — that pressure pushed them to close the task out mentally, leaving more attention for what came next.¹ If you've ever started a meeting with your head still half-inside the email you abandoned, that's the phenomenon.

Worth being precise here: this is lab and field research on task switching and performance, not a claim about your whole day. It describes a real, measurable cost to abrupt switches — not a promise that any one habit will erase it.

The one intervention with direct experimental support

This is the part that matters most, and the part we hold to the highest standard. In 2018, Leroy and Theresa Glomb published a follow-up in Organization Science testing whether anything could reduce attention residue when an interruption forces a switch.² Their answer was a short, structured pause they called a "ready-to-resume" plan: before turning to the interrupting task, you briefly reflect on and plan your return to the work you're leaving — where you are on it and what your next step will be.

Across four studies, that brief plan reduced attention residue, and performance on the interrupting task no longer suffered the way it did without it.² Moderate The mechanism is intuitive: noting where you left off seems to give your mind permission to stop rehearsing it, so attention can move forward cleanly.

This is the evidence-backed core of interstitial journaling. A timestamped note at the seam between tasks — what you finished, where you're stuck, what's next — is a ready-to-resume plan. It's exactly the move Leroy and Glomb tested. That's why the app is built around the gaps: before you start, when you switch, when you get stuck, when you finish.

Naming a mood: associated-with, not a treatment

The app lets you optionally name a mood alongside a note. The reasoning draws on a line of research often summarized as "name it to tame it" — more formally, affect labeling. In a 2007 neuroimaging study, Lieberman and colleagues found that putting feelings into words was associated with reduced activity in the amygdala, a region tied to emotional response, and increased activity in a prefrontal region (the right ventrolateral prefrontal cortex) linked to regulation.³ A 2018 review by Torre and Lieberman gathered the evidence and framed affect labeling as a form of implicit emotion regulation — it can take some heat out of an emotion, often without feeling like effortful coping.⁴

We want to be careful with how far that goes. Weak-to-moderate This is lab research on the effects of labeling emotions, mostly in controlled tasks — it is not evidence that naming your mood in a notes app treats anxiety, low mood, or any condition. The mood field is there because it's a low-cost, evidence-associated way to add a little self-awareness to a note. It is reflection, not treatment. If you're struggling, that's a conversation for a clinician, not an app.

Why low friction matters

None of the above helps if you never do it. The ready-to-resume effect depends on a small action repeated at the right moment — the seam between tasks. So the design goal is to make that capture nearly frictionless: open, type or speak a timestamped line, optionally tag it or name a mood, done. A behaviour you'll actually repeat beats a more elaborate one you abandon by Wednesday.

To be clear, this is a design rationale, not a finding. There's solid general research on habit formation favouring small, cued, low-effort behaviours — but we haven't run a trial showing this particular app builds a lasting habit, and we won't pretend otherwise.

Where the evidence ends

Here's the part most productivity writing skips. Interstitial journaling as a complete practice has not been formally trialed. What has support is narrower: attention residue is real,¹ and a brief ready-to-resume plan reduced it in one well-designed set of experiments.² The mood feature leans on adjacent affect-labeling research,³⁴ not on any study of this app. Bundling those threads into a daily habit is a reasonable bet — but it's a bet, and we'd rather you know that.

This is also why you won't see splashy productivity percentages here. The big round numbers that circulate about journaling and focus tend to come from unrelated studies and get misattributed online. We'd rather earn your trust than borrow theirs. Built on evidence, not hype — and that means telling you where the evidence runs out. You can read more on our science page, and how your notes stay yours on our privacy page.