Cryptomnesia is a psychological phenomenon in which a person mistakes a memory for a new, original idea. Psychiatrists and psychologists believe that most people experience cryptonmesia from time to time, but the extent of the phenomenon and how easily it can be controlled is somewhat controversial.is studies expanded from there to an exploration of how stored memories may influence so-called original thoughts years or even decades after initial exposure. Jungian psychology contends that cryptomnesia is a normal part of most memory processes.