Scientists believe they’ve discovered the origin of déja vu. I always thought it had something to do with a short-term memory accidentally getting stored in the long-term memory bank, but rather it’s a question of a part of your brain called the dentate gyrus not properly processing a new situation that resembles a similar situation that happened in the past, leading you to believe that this exact situation happened in the past. This creepy phenomeon happens to me a lot, so I’m a little disturbed that the sensation is associated with Alzheimer’s. But sometimes I’m in the shower and I can’t remember if I shampooed already or not, so maybe I shouldn’t be surprised.
