The Interstitial Journal blog
Built on evidence, not hype.
Short, evidence-based reads on attention, task-switching, and journaling — what the research actually supports, and where it runs out. New here? Start with the complete guide to interstitial journaling.
Why the Boundaries Between Tasks Matter: Event Segmentation and Memory
The mind cuts a workday into events without being asked. What sits at a cut is remembered better; what spans one comes apart. What event segmentation research supports, why the doorway effect is graded Contested here, and why a line written at the seam is a reasonable inference that nobody has tested.
Read →Where Did the Day Go? Why Memory Is a Poor Timesheet
At six o'clock the day is gone and you can name three things. Remembered time is rebuilt from what changed, not read off a clock — which is why time-use researchers use diaries, and why self-reported screen time drifts from the logs. What a timestamped line can fix, and the three things it can't.
Read →Version 1.3: Interstitial Journal on Apple Watch
The journal on your wrist: dictate a line, start, pause and finish tasks with the same wrap-up as iPhone, watch-face complications, and Siri — plus live updates on every device while the app is open.
Read →Does Writing It Down Help You Remember — or Let You Forget?
A note can fix something in memory, or give your mind permission to drop it. What cognitive offloading, note-taking and saving experiments, and two six-year diary studies of autobiographical memory found — including a much-quoted result graded Contested here — and what a weekly read-back of your journal can and can't do.
Read →What Your Journal Patterns Can and Can't Tell You
A few weeks of entries will produce something that looks like a finding — a busy afternoon, a tag that suddenly dominates, a mood that dips alongside one kind of meeting. Small numbers, regression to the mean and illusory correlation explain why a pattern in your own log is a good question and a poor verdict, and how to read an insights screen with that in mind.
Read →Journaling Under Time Pressure
The days you are supposedly losing most to task-switching are the days you have no room to pause — so does the practice survive a compressed week? A study on interrupted tasks found that anticipating time pressure on the resumption leaves more attention stuck on what you left. What that changes, and why the most-cited study on writing under pressure gets graded Contested here rather than quoted.
Read →Why Journaling Habits Die at the Capture Step
Researchers hid a sensor in a paper diary and found people were filling it in on time about a tenth as often as they sincerely believed. The failure is not motivation, it is the few seconds at the seam — and the Sunday catch-up that repairs the gap quietly converts a journal into the thing it was meant to replace.
Read →What a Mood Tag Is, and What It Isn't
Naming a feeling has real experimental support — and it works without you expecting it to, which makes your own sense of whether it helped a useless test. Almost none of that evidence is about the chart afterwards. Why the words beside the tag are the part doing the work, and where a week of tags stops meaning anything.
Read →Version 1.1: One Design, Every Screen
A full visual pass across iPhone, iPad, and Mac: one violet accent, calmer type, a comfortable reading column on big screens. Insights rebuilt around three questions — how much, when, and where your attention goes — and the running task now stays in step across every device.
Read →Journaling and Sleep
"Write it down before bed" is given without a mechanism or a direction. One polysomnography study compared writing the to-do list against the done list — and the intuitive ritual is the arm that did worse. What pre-sleep writing can do, why earlier beats later, and where this stops being about journaling at all.
Read →What to Keep and What to Delete
Hundreds of saved articles, none re-read, all apparently your fault. But saving was never the operation doing the work. What generation, retrieval and desirable difficulties actually support — including the handwriting study that later failed to replicate — and the permission most notes advice won't give you.
Read →The Ten Seconds Between Meetings
Six meetings is six units of work plus five transitions — and the transitions are the part nobody schedules. What switch costs and attention residue do to a back-to-back day, and the one line that fits in the gap you don't have. Graded Early to Strong.
Read →What to Write When Nothing Happened
Recall is built from peaks and endings, not from duration — so an ordinary Tuesday compresses to nothing and the blank page feels justified. Why "nothing happened" is a retrieval problem, plus eleven narrow prompts for a flat day. Graded Early to Strong.
Read →The Planning Fallacy: Why "Twenty Minutes" Is Never Twenty Minutes
We reliably underestimate how long our own tasks will take — even when we remember the last one running long. Why the fix is an outside view, and how a timestamped log builds a personal reference class. Graded Early to Strong.
Read →The Zeigarnik Effect: Why Unfinished Tasks Keep Tapping You
Unfinished tasks linger in the mind — but the research suggests it isn't finishing that quiets the loop, it's writing down the next step. The evidence behind the interstitial line. Graded Contested to Strong.
Read →Interstitial vs. End-of-Day Journaling: Which Fits the Workday?
Capturing notes between tasks and reflecting once at day's end lean on different research and do different jobs — continuity versus learning. An evidence-based comparison, and why the two stack. Graded Strong to Contested.
Read →The Hidden Cost of Task-Switching — and How a Pause Helps
Switch costs and attention residue make jumping between tasks more expensive than it feels. What the research actually shows — and why a brief note at the boundary is a reasonable response. Graded Strong to Contested.
Read →Work-Journal Prompts for the Gaps Between Tasks
A small set of prompts for the seams between tasks — starting, switching, getting stuck, finishing. Each one tied to the research it leans on, and graded against the evidence.
Read →Attention Residue and the Evidence-Based Case for Interstitial Journaling
Attention residue is the part of your focus that stays stuck on the last task. One experiment shows a brief "ready-to-resume" note helps it clear — here's the evidence, and where it ends.
Read →