@burcidi - I would love to read these articles (and it reminds me of the movie "Nell").
I work with children who don't develop verbal language, most of the time it is because they have a profound intellectual disability. Sometimes though, you see them develop other skills, but they do not talk. Sometimes it seems to be a part of their disability of autism, which particularly affects the communication areas of the brain.
But mostly I am curious about how these people who had never seen civilization did communicate, because although many of the children I work with do not have verbal language, many communicate through other means such as facial expressions, gestures, or simple vocalizations.
So i wonder if the people who had never been a part of civilization tried to communicate in some way or if that was not innate...