You remember everything perfectly and can conjure up vivid details from past events. You automatically pass any Lore check made to remember your own experiences. This allows you to recall specific details that you, as a player, have forgotten, but that your character would remember.
A person may have both a Photographic Memory and a Terrible Memory — the result of a disorganized mind. Some details stick out, and for no good reason, but others fade away.
Amnesiacs are even more fun: you can remember nothing up to a certain point, but have excellent recall for everything subsequent to that time.