Inventing tall stories.

Psychological research increasingly shows that inventiveness is fundamental to the normal operation of the mind. Aikaterini Fotopoulou is a research psychologist at the Institute of Cognitive Neuroscience, London, who specialises in confabulation. She regards it as a failure of the psychological mechanisms responsible for memory. “These inventions are really memory constructions,” she says. “When people confabulate they are failing to check the origin of the material that they build into their memories. You or I can usually tell the difference between a memory of something we’ve done and a memory of something we’ve just heard about, and distinguish both from stray thoughts or hopes. Confabulators can’t do this. Material that, for emotional or other reasons, comes to mind can at times be indiscriminately assumed to be a memory of what really happened.”
From here.