My mother was telling me about this just the other day. Doors are apparently evil by nature, they have a powerful spirit-field that wipes your memory when you pass through them. As in, “What did I come in here for, again?” The researchers have studied this and determined that the effect is real, but they only say, “eh, it’s how the brain works”; we need to get the metaphysicists (and feng shui experts) right on this, to figure out why these poltergeists like to occupy doorframes, so that we can placate, neutralize or exterminate them, once and for all.
Or we could just redesign our living and working spaces in the classical Japanese style, with sliding wall in place of doors. And cars without doors, too.
But do we know it’s the door itself? Maybe it’s the frame. Maybe it’s because it’s a gap in a wall. I don’t recall hearing that the Japanese, with their hoity toity sliding doors, have better memories than the rest of the world. Of course, maybe I did hear it but have forgotten.
It is not sliding doors, it is sliding walls, where you can sit lotus in a room, someone else slides the walls around, and you are now in a functionally different room without having moved anywhere. Not sure how that would affect the neurological mechanism that responds to door-memory-fields.
It’s not just doors. I can forget something just walking across a single room… no thresholds, no doorsills, no portals of any type. Just space and time and brain damage.