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You enter your living room, then pause. You feel your mission’s momentum— but its aim is suddenly lost. So, what just happened? And why does it keep happening? Well, you’re not alone; this is actually a common phenomenon scientists have termed the doorway effect. According to psychological models, our brains parse life’s continuous flow of time and activity into distinct events. As a situation unfolds, the brain develops a working model of the event. It likely does this by employing its default mode network, the brain regions that work together to accomplish many resting thought processes. Then, when there's a big enough change, the brain is thought to identify an event boundary, at which point it stores the prior event model, and begins developing a new working model. During this switch, called an event update, parts of the default mode network seem to interact with the memory-storing hippocampus, perhaps transporting the experience into longer-term memory. In the process, the brain clears its short-term memory, making room for the new information that’s already pouring in. But sometimes that can be stuff you weren't quite done with. It’s still not fully clear if the doorway effect, also called the location updating effect, befalls some people more than others. But one study found that age had very little bearing. Scientists are working to better understand the phenomenon by pinpointing the conditions that trigger it, which, yes, includes doorways, both physical and virtual. In one study, college students in real and virtual spaces were asked to pick up objects, walk set distances carrying them out of view, then try to recall what they were holding. Time and distance remained constant, but some traveled through a doorway. Those who did tended to respond slower and be more likely to forget. And passing through multiple doorways seems to worsen the memory-thwarting effect. It's also not helped by multitasking. In another VR experiment, participants were first asked to memorize the colors and shapes of different objects. Then, some moved across the same room while others entered another. When they were asked to also complete a counting task, those who traveled through the doorway had a harder time recalling the original objects. Moving through the doorway distracted seemed to somehow overload their memory. But the effect plagues people beyond literal doorways. Looking through clear walls into adjacent rooms also appears to do the trick. And really, whatever triggers an event update is thought to do the same: an alarm ringing; a friend changing the subject; or a shift in location, time, motivation, or computer tab. Likewise, when people come upon an event boundary while reading stories, like a sentence describing a considerable time jump, researchers have observed that their reading speed may slow, their neural activity increases, and they have more difficulty answering questions about what a character was just doing. But this isn't always the case with event updating. In certain circumstances, doorways actually seem to aid memory. In one study, participants were given lists of words, and in between them, they either moved spots within one room or walked into another. Those who switched rooms wound up recalling the words more faithfully. The key difference in a doorway’s ability to strengthen versus muddle memory might be the act of separating information into discrete events versus sharing it among multiple. This may result in clearer compartmentalization that helps reduce competition and interference when trying to recall the information. Generally, event updating is the brain attempting to adapt to new situations. But the doorway side effect can be disorienting. So, how can we best pick our train of thought back up? Thankfully, the confusion tends to resolve on its own. But retracing your steps may help jog your memory. And people have also suggested that attempts at deliberately preventing the doorway effect can help, consciously keeping their goal in mind— perhaps repeating it verbally. Really, whatever helps you stay caught up so your head doesn’t get ahead of you.

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Overview of the Video

Video Title

Ever walk into a room and forget what you were doing?

Author

Gabriel Radvansky for TED-Ed

Duration

6 minutes

Description

The video explores the doorway effect, a phenomenon where entering a new space can lead to forgetfulness about what one was doing before. Gabriel Radvansky delves into the psychological mechanisms behind this common experience.

Main Themes

The Doorway Effect

Defined as a common memory lapse experienced when transitioning between spaces.
Key Question: What happens to our memory during these transitions?

Psychological Mechanisms

Our brains divide experiences into discrete events.
The default mode network is engaged during this process, which interacts with memory-storing regions like the hippocampus.
Transitioning between events is termed an event update, which can result in forgetfulness.

Factors Influencing the Effect

Physical and Virtual Doorways: The effect is triggered by both real and simulated transitions.
Multitasking: Engaging in multiple tasks exacerbates memory lapses.
Age: Research suggests age does not significantly affect susceptibility to the doorway effect.

Research Insights

Notable Studies

Real vs. Virtual Spaces:
- Participants were tasked with carrying objects through doorways.
- Those who passed through doorways showed slower recall times and higher forgetfulness.
Multitasking in Virtual Reality:
- Participants memorized objects while some moved through doorways.
- The act of going through doorways distracted them, making recall harder.
Event Boundaries in Reading:
- Encountering significant shifts in narrative can slow reading speed and impede comprehension.

Contradictory Findings

Interestingly, moving through doorways can sometimes enhance memory recall.
A study indicated that participants moving between rooms recalled lists of words more effectively than those who remained in one room.

Mechanisms Behind Memory Updates

Compartmentalization

Separating information into distinct events helps reduce interference.
Clear compartmentalization can aid in memory retrieval, contrasting with the muddled recall often caused by the doorway effect.

Adaptation to New Situations

The brain's attempts to adapt during event updates may lead to temporary disorientation.
Strategies to mitigate forgetfulness include:
- Retracing steps: Physically or mentally going back to the previous space.
- Verbal repetition: Consciously reminding oneself of their goal or task.

Conclusion

Summary of Key Points

The doorway effect illustrates the intricacies of human memory and cognition.
While often frustrating, this phenomenon is a natural part of how our brain processes information.
Understanding the doorway effect can help individuals develop strategies to cope with forgetfulness in daily life.

Final Thoughts

"Whatever helps you stay caught up so your head doesn’t get ahead of you."
This concluding thought emphasizes the importance of self-awareness and proactive memory strategies in managing the doorway effect.

Ever walk into a room and forget what you were doing? - Gabriel Radvansky

TED-Ed•Open on YouTube •via YouTube

965,469 5:45 Sep 8, 2026

Description

Dig into the phenomenon known as the doorway effect, where walking into a new space can make you forget what you were doing. -- You enter your living room, then pause. Uh-oh, what was it that you were doing? You feel your mission’s momentum wane, and its aim is suddenly lost. So, what just happened? Well, you’re not alone; this is a common memory lapse phenomenon scientists have termed the “doorway effect.” Gabriel Radvansky explores why walking into a new space can make you suddenly forget what you were doing. Lesson by Gabriel Radvansky, directed by Biljana Labović. Animation by Vanesa Souss: https://www.vanesasouss.com Support Our Non-Profit Mission ---------------------------------------------- Support us on Patreon: http://t.ted.com/nlVpzFN Check out our merch: http://t.ted.com/upNeDi3 ---------------------------------------------- Connect With Us ---------------------------------------------- Sign up for our newsletter: http://t.ted.com/R7iMQzr Follow us on Facebook: http://t.ted.com/NKcsscO Find us on Twitter: http://t.ted.com/nXsWmpA Peep us on Instagram: http://t.ted.com/zuDVFXP ---------------------------------------------- Keep Learning ---------------------------------------------- View full lesson: https://ed.ted.com/lessons/ever-walk-into-a-room-and-forget-what-you-were-doing-gabriel-radvansky Dig deeper with additional resources: https://ed.ted.com/lessons/ever-walk-into-a-room-and-forget-what-you-were-doing-gabriel-radvansky/digdeeper Animator's website: https://www.vanesasouss.com ---------------------------------------------- Thank you so much to our patrons for your support! Without you this video would not be possible! Sydney Evans, Latora, Noel Situ, emily lam, Sid, Niccolò Frassetto, Mana, I'm here because of Knowledge Fight Facebook group., Linda Freedman, Edgardo Cuellar, Jaspar Carmichael-Jack, Michael Burton, VIVIANA A GARCIA BESNE, The Vernon's, Olha Bahatiuk, Jesús Bíquez Talayero, Chels Raknrl, Sai Pranavi Jonnalagadda, Stuart Rice, Jing Chen, Vector-Dopamine math, Jasper Song, Giorgio Bugnatelli, Chardon, Eddy Trochez, OnlineBookClub.org, Eric Shear, Leith Salem, Omar Hicham, Adrian Rotaru, Brad Sullivan, Karen Ho, Niklas Frimberger, Hunter Manhart, Nathan Nguyen, Igor Stavchanskiy, James R DeVries, Grace Huo, Diana Huang, Chau Hong Diem, Orlellys Torre, Corheu, Thomas Mee, Maryann H McCrory, Blas Borde, John Hellmann, Poompak Meephian, Chuck Wofford, Adam Pagan, and Wes Winn.

Details

Published: Sep 8, 2026
Views: 965,469
Duration: 5:45
Tags: doorway effectdoorway phenomenonmemoryforgettingforgetfulnesslocation updating effectbrainpsychologyevent modelevent boundaryevent updateshort term memory+20 more