The Doorway Might Not Be the Doorway

Back in the early 2000s, the original doorway experiment looked simple and clean.

Researchers built a small virtual environment — a series of rooms with tables in them. Participants walked from one table to the next, carrying an imaginary object. Sometimes the next table was in the same room. Sometimes it was through a door. Then a question popped up: what were you carrying?

People remembered worse after walking through a door.

This was the location updating effect, also called the event horizon effect — the idea being that your brain treats a doorway as the boundary between one event and the next, and sweeps the working-memory desk clean when it crosses the line.

For two decades, that was the story. Textbooks repeated it. Magazine articles repeated it. People used it to explain to their parents why they kept forgetting things. The doorway became a small celebrity in cognitive psychology.

The careful repeats started showing something different

In 2021, a research team in Australia decided to test the effect very carefully. Not once. Four times.

They built two virtual reality environments — one with a working memory load (you had to hold a few things in mind), one without. They added a passive-video version, where the participant just watched someone else move from room to room. They added a real-life walking version, where the participants actually walked through a physical building from one room to another.

Each version was designed to give the doorway effect every chance to show up. Different methods, different settings, different levels of immersion. If walking through a doorway sweeps the desk clean, surely it would do that across at least most of these conditions.

Mostly, it didn't.

In three of the four experiments, the forgetting effect just wasn't there. People remembered objects roughly as well after crossing a doorway as they did standing in one place. The cleanest version of the famous effect — replicated across four conditions — produced almost nothing.

Except for one condition. The one where the brain was already doing too much.

When participants had to hold extra information in mind and walk through a doorway, recognition memory got worse. Not for what they were carrying, exactly — but for whether the thing they were being asked about was actually one of the things they had seen. False recognitions went up. The brain, under load, became less reliable about which event a memory had come from.

So the doorway didn't sweep the desk clean. It made the desk slightly harder to read, when the desk was already messy.

That same year, a separate team at Bond University in Australia ran a related set of experiments and reached a similar conclusion. The doorway effect, they reported, only showed up when people's brains were already overloaded — when the cognitive resources for tracking events were stretched thin.

Doorways did not always cause forgetting. The forgetting only showed up when the brain was already overloaded.

That is a small but important rewrite of the famous story. And it leaves a question hanging.

If the doorway alone isn't the boundary — what is?

That question got a fresh answer in 2025. The next chapter is about what they found when they stopped looking at walls and started looking at goals.

References

• Lawrence, Z., Petersen, D., Iyer, S., & Whitfield-Gabrieli, S. (2021). Doorways do not always cause forgetting: A multimodal investigation. BMC Psychology, 9(1), 41.
• Baumann, O., & Skilleter, A. J. (2021). Doorway effect investigation under cognitive load. Bond University, virtual reality memory study.