The Zeigarnik effect on Short time memory (STM) You pull out the key to open your house. You unlock the door and get inside. Then several hours later you're looking for the key and wondering where it is. And you discover that you have left it behind on the door. Has this happened to you? To understand why it happens, let’s flashback to Bluma Zeigarnik, a Russian psychologist. One evening, Zeigarnik and her friends went out for dinner to a restaurant. They had a lovely meal. Guess what the highlight was?...