Just to clarify, the book is citing the condition of
retrograde amnesia, or the loss of memory of past events.
I also don't see why this is even an issue. Amnesia patients retain the ability to speak, write, etc, as well as motor skills and route reflexes.
Wiki's are flawed expert sources, but this comes close to what I know:
QUOTE
However, there are different types of memory, for example procedural memory (i.e. automated skills) and declarative memory (personal episodes or abstract facts), and often only one type is impaired. For example, a person may forget the details of personal identity, but still retain a learned skill such as the ability to play the piano.
Examples:
Someone with total amnesia who trained in martial arts for 10 years and forgets about it will still react the same when attacked.
Amnesia patients who do not remember their name can still
sign their name because it's a separate neural pathway.
Ever forget a phone number until you start dialing? That's the same idea.
Languages can be learned with conversational fluency (rating 3) in less than 6 months on average, if
not immersed in the language. Many people take less than that. Immersion factors tend to speed things up even more.
Amnesia itself, as a condition, can be something that lasts forever, depending largely on why it occurred. Someone may remember things in days, weeks, years, or never.
As for the reason for the loss, that may be up to your Gamemaster. In our group, Amnesia patients have their backstory written by the GM, so he can actually make it a real determent worth 10 points.
From a GM perspective: can a past that is more than 8 years old come back to haunt a person in a way that justifies a 10 BP negative quality? I'd say yes. The negative quality for 10 BP never cites loss of current lifestyles or practices. That's the 25BP one.