which room is my thought in

Heard a report today on WGIR-FM rock 101, that when you enter a room, that when you walk through a door way it can clear your memory of why you went into that room in the first place. I believe this because I have had to go back to the room where I first had the thought of what to do or what I was getting, in order to remember why I left that room in the first place. When I go back to the exact spot I originally had that thought I remember why I left the room but cannot remember until I go back to the original spot. Follow me? I rewrote this several times trying to get the wording correct in order to understand what I am saying, not sure if I got it right.