"Amnesia, there's just no clue as to its cause at all. Look at her; she has no external injuries, everything in her brain is normal, and the neural responses are not only normal but can even be considered excellent. It's impossible to see what might have triggered the memory loss."
"Moreover, the issue of amnesia doesn't have a definitive explanation in the current medical field, including how memories are stored, operate, and are retrieved in the brain. That also remains unclear."
"The only known cause of memory loss at the moment is extended hibernation in a Hibernation Pod... but now, even the first group of volunteers that entered the Hibernation Pods hasn't reached the 10-year memory safety limit, so naturally, there's no data."