The key finding is that memory performance was poorer after travelling through an open doorway, compared with covering the same distance within the same room. “Walking through doorways serves as an event boundary, thereby initiating the updating of one’s event model [i.e. the creation of a new episode in memory]” the researchers said.
photo via flickr:CC|kimba
This explains a lot. Example: I would have done better on my exams at school if I hadn’t walked through so many doors.