Depends solely on the external factors... The cave person would probably resemble a diminished version of a normal human. Because if youre educating them, it requires interaction, and interaction would provoke development in the same general direction as we develop. Except without external stimulus itd be pretty fucked... It just wouldnt work.

But yeah... this reminds me of this case, a girl who went missing at birth and was found to be raised by a pack of dogs:

http://www.theage.com.au/news/world...3166383022.html

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