Amnesia

Amnesia is a medical condition which results in the loss of memory. It comes in two general forms, anterograde amnesia where new memories are not transferred to long term memory and retrograde amnesia which is the loss of past memories.

When Lieutenant Terri Letac awoke in 2391 she was told she was suffering from retrograde amnesia, which was why she could not recall the events that led to her waking sixteen years in the future. In reality she was experiencing a simulated future created by the Vorta Borath and her memories where been disrupted by a memory blocking device.