Transient Global Amnesia

This is a pure disturbance of memory for both present and recent past, typically lasting between four and six hours. People remain alert, in contact with their environment with normal speech and intellect but with a characteristic tendency to ask the same questions over and over again. It is usually a one-off occurrence, there is no known cause but if they recur and are shorter than usual, then epilepsy should be considered. No tests are necessary.