Loss of memory, temporary or permanent, is known as Amnesia, which can broadly be divided into Retrograde amnesia, where patients can't recall events before the onset of amnesia, anterograde amnesia, where they can't retain memories after the onset of amnesia and post-traumatic amnesia when the memory loss is triggered by an accident or traumatic event. Amnesia usually affects factual recollection of people, places and events, rather than learned behavior...