The man who mistook his wife for a hat

Oliver Sacks wrote The man who mistook his wife for a hat

"Here Dr. Sacks recounts the case histories of patients lost in the bizarre, apparently inescapable world of neurological disorders: people afflicted with fantastic perceptual and intellectual aberrations; patients who have lost their memories and with them the greater part of their pasts; who are no longer able to recognize people and common objects; who are stricken with violent tics and grimaces or who shout involuntary obscenities; whose limbs have become alien; who have been dismissed as retarded yet are gifted with uncanny artistic or mathematical talents.

Michael Nyman composed an opera based on this book.

"The plot concerns the investigation by a neurologist of the condition of a singer who suffers from visual agnosia. According to the liner notes, Morris, Rawlence, and Nyman had to spend much time convincing the real Mrs. P. (whose husband is implied to have been a known name) that they were not proposing a musical (her word) that would trivialize her late husband's situation in order to gain her consent"

Still waiting for the book. The opera is just brilliant! Can't stop listening to it.