An Amnesic Patient With An Extraordinary Distorted Memory

People with normal memories are unable to answer this type of question because it is beyond their memory capacity. This is the first reported case of a pathological condition that the authors of the article named ‘Confabulatory Hyperamnesia’.

Patient LM, described in this study, is a 68-year-old man, who, following more than 30 years of heavy drinking, developed Korsakoff’s syndrome, a condition characterized by severe amnesia and confabulation, the unintentional production of false memories by amnesic patients who are unaware of their memory deficits. Patients who confabulate produce more or less plausible false memories answering questions like “What did you do yesterday?” or “How did you spend your last vacation?”, but, just like people with normal memory, they answer “I don’t know” to questions like “Do you remember what you did on March 13, 1985”. What makes LM different from other confabulators is his unusual tendency to consistently provide a confabulatory answer to this type of questions. He would say, for example, that on March 13, 1985 he spent the day at the Senart Forest (a place where he used to go often with his family) or that he could remember that on the first day of summer in 1979 he was wearing shorts and a T-shirt.

LM’s confabulatory hyperamnesia could not be traced back to any specific pattern of brain damage and the MRI brain scan was unremarkable. The authors conclude that LM shows an expanded consciousness of his past, a consciousness which has surpassed the limits of time and details.