What causes temporary and complete amnesia?

What causes Amnesia memory loss blackout and concussion?

• Answer:

  There a number of causes, extreme trauma, shock- explosions ( War damage) - bombs, protective retreat, guilt complex- it is a deep mystery- Anastasia could never recall the exact sequence of events of the Night of July l7-l8 of l9l8- the massacre that killed her family- and was indeed, the Crime of the Century ( twentieth century).In my opinion alone that gives her a boost- the intense trauma caused a neural block.