Explain why cryptamnesia is described as "not remembering that one is remembering" rather than simply as a failure of memory.

The phrase captures something specific about cryptamnesia: the memory process itself has not failed in the ordinary sense, since the material is genuinely retained and successfully reproduced, sometimes even word for word. What has failed is the accompanying awareness that this reproduced material is a memory at all, rather than a new creation — the sense of familiarity or recognition that would normally flag it as "something I have encountered before" is simply absent. This is why cryptamnesia sits among the distortions of recognition and paramnesia rather than among straightforward amnesias: the content is not lost, only its correct attribution as prior experience, leaving the person with the sincere, mistaken conviction of originality.