The main feature is loss of memory, usually of important recent event, which is not due to organic mental disorder and is too extensive to be explained by ordinary forgetfulness or fatigue.
The amnesia is usually centered on traumatic events, such as accidents, combat experiences, or unexpected bereavements, and used to be partial and selective.
The amnesia typically develops suddenly and can last from minutes to days.
Differential diagnosis: complicated; it is necessary to rule out all organic brain disorders as well as various intoxications. The most difficult differentiation is from conscious simulation - malingering.