[In search of lost time--memory in dementia].

With the progressing loss of coherent memory the world of the demented person dissolves into a succession of fragmented and incomprehensible situations. The resulting uncertainty leads to an increased need of self-assurance: in search of familiar surroundings and personal identity, the patient escapes into his preserved memories and begins to live in his past. Reminiscence may thus become a source of continuous strain to the persons entrusted with caring for the patient; on the other hand, it may as well open avenues to a deeper understanding of the patient and his world.