What is the doorway effect?

The doorway effect is the tendency to forget what you were doing right after you walk through a doorway into another room. Gabriel Radvansky and colleagues at the University of Notre Dame reported it in 2011: crossing a threshold acts as an 'event boundary' that files the previous room's context away, so the plan you formed in the old room becomes harder to retrieve in the new one. It happens in real rooms and in virtual ones, so it isn't about the physical walk.

Does walking through a doorway always cause forgetting?

No. A 2021 multimodal study by McFadyen, Baumann and colleagues could not reproduce the effect on its own. The forgetting only showed up clearly when participants were also under working-memory load, doing a demanding counting task at the same time, and even then it appeared as more false alarms rather than fewer correct answers. So the doorway effect is really a working-memory effect that a threshold can trigger when your head is already full.

Why does the doorway effect seem worse with ADHD?

Working memory is the temporary holding space for whatever you're currently trying to keep in mind, and it is small for everyone. A 2013 meta-analysis of adults with ADHD found moderate deficits in working memory across both verbal and visuospatial domains. If the effect only appears when working memory is loaded, then a system that runs closer to capacity by default will trip it more often. The doorway didn't erase the plan; the plan was never held firmly enough to survive the crossing.

How do I stop forgetting why I walked into a room?

Stop asking your memory to carry the intention across the threshold. Say it out loud, or better, write it down the instant it forms. Research on intention offloading found roughly 45 percent forgetting when people relied on unaided memory versus about 5 percent when they set an external reminder. Capturing the thought where you stand turns a memory problem into a reading problem, and reading is reliable.

How does Ikoi help with this?

Ikoi's capture is built to catch a thought the second it forms, before a doorway or a task switch can file it away, and sort it later. You dump the intention in one motion and deal with organizing it afterward. The design assumes you will forget if the thought has to survive a walk to another room, so it removes the walk from the equation.

I walked into the kitchen and forgot why. The doorway effect is a working-memory bug you can design around.

I stood up from my desk with a clear and specific mission. Go to the kitchen, get the phone charger I left on the counter, come back. Simple. Three seconds of planning, fully formed, held in my head.

I walked into the kitchen and had no idea why I was there. None. I stood between the fridge and the sink with the exact facial expression of a man who has just been unplugged. I got a glass of water because that at least explained why a person might be standing in a kitchen, went back to my desk, sat down, saw my dead phone, and said a word I won’t write here.

This happens to everyone. It has a name and a small pile of research behind it, and once you understand the mechanism, you stop treating it as a personal defect and start treating it as a design problem you can actually solve.

The doorway did it

The phenomenon is called the doorway effect, and the clearest early evidence comes from Gabriel Radvansky and colleagues at the University of Notre Dame in 2011. They had people carry objects through rooms in both real and virtual environments and quizzed them, mid-walk, on what they were holding. Answers were slower and less accurate right after the person passed through a doorway than after walking the same distance within a single room.

Radvansky’s explanation is that the brain doesn’t store experience as one continuous film. It chops it into episodes, and passing through a doorway is a strong cue to cut. Crossing the threshold acts as an “event boundary” that, in his words, “separates episodes of activity and files them away.” The plan I made at my desk belonged to the desk episode. Walking into the kitchen opened a new episode and shelved the old one, charger and all. The forgetting isn’t the walk tiring me out. It’s the filing system doing its job a little too eagerly.

The tidy part of this finding is that it happened in virtual environments too, where nobody’s legs moved. So it isn’t the physical exertion of walking. It’s the boundary itself, the mental “new scene” that a door represents.

Except the doorway doesn’t always do it

Here’s where the story gets more useful. In 2021, a team led by McFadyen and Baumann tried to reproduce the effect across four experiments, including immersive VR and real physical movement. On its own, the doorway did almost nothing. Walking through a door did not reliably make people forget.

The forgetting only appeared in the experiment where participants were also carrying a working-memory load, counting backwards while they moved. And even then it showed up as an increase in false alarms rather than a drop in correct answers. Their conclusion was that the effect “is likely to be more nuanced than originally thought, as it only emerged in the form of increased false alarms under considerable working memory load.”

Read that twice, because it reframes the whole thing. The doorway isn’t the cause. The doorway is a trigger that fires when your working memory is already full. An empty head walks through a door and keeps its plan. A loaded head walks through the same door and drops it.

Working memory is small, and ADHD runs it hot

Working memory is the temporary scratchpad where you hold the thing you’re doing right now: the charger, the sentence you’re about to type, the reason you opened this browser tab. It is famously small for everyone. It is also, in ADHD, measurably smaller in effect.

A 2013 meta-analytic review of adults with ADHD pooled dozens of studies and found moderate-magnitude deficits in working memory relative to controls, across both the verbal and the visuospatial domains. Not catastrophic, not absent, moderate and consistent. Combine that with the McFadyen finding and the whole experience I have with charger-shaped amnesia snaps into focus. If the doorway effect only fires under working-memory load, and my working memory is closer to capacity on an ordinary Tuesday, then I’m carrying the load that triggers the effect basically all the time. My baseline is somebody else’s counting-backwards condition.

This is the same reason a plan I make while switching from one task to another tends to evaporate: the switch itself is a load, and anything I was holding loosely falls out during the handoff. The doorway is just a very literal, very architectural version of the same handoff.

The fix is not a better memory

Every listicle about the doorway effect ends with advice like “pause and repeat your goal” or “visualize the object before you leave.” That works about as well as telling someone with poor eyesight to squint harder. You are asking the exact system that failed to try again with more effort.

The better move is to stop asking working memory to carry the intention across the threshold at all. Get the thought out of your head and into the world before the door can file it away.

There’s good research on why this works. A review of intention offloading, the practice of creating an external cue for a delayed intention, reports that people forget roughly 45 percent of intentions when relying on unaided memory, and only about 5 percent when they set an external reminder. That’s close to a tenfold improvement, and it comes from a sticky note, not from trying harder. The same review notes that people offload more as the load grows, setting more reminders when they have three things to remember instead of one, and that external cues can bring people with weaker memory close to normal performance. Your brain already knows this. It reaches for the external cue precisely when the internal one is about to fail.

The trick is doing the capture at the moment the intention forms, while you’re still in the room where it makes sense, before you cross anything. Standing at my desk, the correct move was never “hold the charger thought carefully all the way to the kitchen.” It was “say charger out loud” or, on a real work task, type it somewhere the instant it appeared.

What this means for a tool

Most apps assume the intention arrives intact at the app. You had a thought, you walked to your phone, you opened the app, you navigated to the right list, you typed. That’s four doorways between the thought and the record, and any one of them can file the thought away before you get there. The friction of capture is the leak.

So the design job is to shorten the distance between “I just had the thought” and “the thought is written down” to almost nothing. This is why I keep coming back to capture speed as the feature that actually matters for ADHD, over syntax and integrations and everything else that gets compared in app roundups. In Ikoi, capture is one motion: dump the thought now, sort it later. The sorting is a separate job you do when you have working memory to spare. The capture has to survive the moment, and the moment is short.

It pairs with the first-step field: capture gets the intention out of your head before a doorway eats it, and the first step makes sure that when you come back to it, you can actually start. One catches the thought, the other makes it startable. Neither asks you to hold anything in your head across a room.

The reframe

The doorway effect is not evidence that your memory is broken. It’s evidence that human memory is organized around scenes, and that scenes have edges, and that crossing an edge with a full head drops whatever you were holding loosely. Everyone lives with this. People with ADHD live with a version where the head is fuller by default, so the edges cost more.

You can’t make the doorways go away, and you can’t make working memory bigger by wanting it to be. What you can do is stop using working memory as luggage. Write the intention down where you’re standing, before the door files it. Then walking into the kitchen and forgetting why becomes a thing that happens to your notes app instead of to you, and your notes app never forgets.

I still walk into rooms and blank. But now, more often, I glance at my phone and it says “phone charger,” and I feel less like a man who’s been unplugged and more like one who left himself a decent trail.

Related reading: Task switching is the bill your todo app doesn’t itemize covers the other everyday handoff that drops what you’re holding, and the 2-minute door opener covers what to write down so the captured thought is actually startable later.