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. Here’s the scientific reason you randomly blank out on facts that you know.
If you can’t concentrate during the irritating sound of a truck backing up, blame the brain baffle on an evolutionary glitch. Natural sounds are created from a transfer of energy (say, a stick hitting a drum) and gradually dissipate, and our perceptual system has evolved to use that decay of sound to figure out what made it and where it came from. But beeps don’t typically change or fade away over time, so our brains have trouble keeping up. Learn about these 50 surprising brain facts we bet you never knew.