If we are indebted to Pitres for the term of ecmnesia, its current definition is restricted to the translation of a patient in his (her) past, heightened by a feeling of actually living it. Initially considered as a spontaneous hysterical phenomenon, or obtained by means of hypnosis, ecmnesia appears to be a neuropsychiatric syndrome which can also be due to organic etiologies. Meanwhile, the fascinating theme of age regression, and the popular success of many pseudo medical stories, coming from the US, explain the diffusion of the theme in literature and cinema.