Feral Child

This is a documentary called 'Genie: Deprived Girl', about a child who was evidently locked inside a room for the first 13 years of her life. Whoa.




"Secret of the Wild Child" was a PBS special about Genie, and the link will take you to a transcript of the broadcast.
 - YouTube video of the special: Part 1, Part 2 (through Part 6)

The Wikipedia page for 'Feral Child' has some excellent resources...

One of the earliest 'modern' feral children was a boy called Peter who was discovered living in the woods near Hanover, Germany, about 1725. Peter the Wild Boy was taken to London, where he became a celebrity and even spent some time living in Kensington Palace. He never learned to say more than "Peter" and "King George".

A more recent example is Oxana Malaya, who lived until she was eight or nine in a kennel with dogs and took all her behavioral cues from her four-legged friends.