[@Buddha] Yes, it's somewhat like these severe cases of amnesia. 

They can't have precise memories of well, anything. They don't know what shit looks like. But they have common sense, and the definition of terms brought up make sense to them. But if you were to say the sky is blue, they'll see it as something obvious, but can't quite picture it. 

So no, they don't have any knowledge of the outside world. But they can have a vague idea of what it could be based on their integrated database yeah.