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The doctors have a name for it: confabulation. The filling in gaps in memory by unconstrained fabrication.
In the latter half of the 19th Century, there was this Russian psychiatrist named Sergei Sergeyevich Korsakov observed this behavior in chronic alcoholics. Most often, these patients resorted to imagination to compensate for irregular memory loss and impaired ability to acquire new information.
The phenomenon is called Korsakov's psychosis.
Listen: most of this blog is true ...