People create false memories frequently without even realizing it. False memories fall under cognitive psychology which includes perception, learning and how you remember things. A false memory is more of a distorted memory, it’s not completely incorrect but rather blurred at the edges. The more traumatic an event was, the more vivid the memory is which leads to it being less likely for there to befalls memories present. Generally the memory falseness is minor such as forgetting where you last saw your keys.
