...A “completely different” idea comes from a team of researchers at the University of Notre Dame.  The first part of their paper’s title sums it up:  “Walking through doorways causes forgetting.”

Gabriel Radvansky, Sabine Krawietz and Andrea Tamplin seated participants in front of a computer screen running a video game in which they could move around using the arrow keys.  In the game, they would walk up to a table with a colored geometric solid sitting on it. Their task was to pick up the object and take it to another table, where they would put the object down and pick up a new one. Whichever object they were currently carrying was invisible to them, as if it were in a virtual backpack.

Sometimes, to get to the next object the participant simply walked across the room. Other times, they had to walk the same distance, but through a door into a new room. From time to time, the researchers gave them a pop quiz, asking which object was currently in their backpack.  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.
...

The doorway effect suggests that there's more to the remembering than just what you paid attention to, when it happened, and how hard you tried.  Instead, some forms of memory seem to be optimized to keep information ready-to-hand until its shelf life expires, and then purge that information in favor of new stuff.  Radvansky and colleagues call this sort of memory representation an “event model,” and propose that walking through a doorway is a good time to purge your event models because whatever happened in the old room is likely to become less relevant now that you have changed venues.  That thing in the box?  Oh, that's from what I was doing before I got here; we can forget all about that.  Other changes may induce a purge as well:  A friend knocks on the door, you finish the task you were working on, or your computer battery runs down and you have to plug in to recharge.

Why would we have a memory system set up to forget things as soon as we finish one thing and move on to another?  Because we can’t keep everything ready-to-hand, and most of the time the system functions beautifully.  It’s the failures of the system—and data from the lab—that give us a completely new idea of how the system works."

Likewise, I would have said something, but they've asked not to explain.  You had to be there, anyway.

 RedGuitar wrote: