Ever walk into a room with some purpose in mind, only to completely forget what that purpose was? Turns out, doors themselves are to blame for these strange memory lapses. Psychologists at the University of Notre Dame have discovered that passing through a doorway triggers what’s known as an event boundary in the mind, separating one set of thoughts and memories from the next. Your brain files away the thoughts you had in the previous room and prepares a blank slate for the new locale.
Which is why retracing your steps often helps recall your original intention. Located in the room or space where you had the initial idea, it will often come back to you. Of course then you have to hang onto it till you get through the door again.