The quiz was timed so that when they walked through a doorway, they were tested right afterwards.

The quiz was timed so that when they walked through a doorway, they were tested right afterwards. As the title said, walking through doorways caused forgetting: Their responses were both slower and less accurate when they'd walked through a doorway into a new room than when they'd walked the same distance within the same room.

Hmmm.
https://www.scientificamerican.com/article/why-walking-through-doorway-makes-you-forget/