Around 1970, child services were called to a Californian home. What they found inside was a young girl who was completely immobilized and bound to a toilet. This girl was isolated from any form of human contact and language for 13 years. She had never picked up on the English language, she used shrieks and growls to communicate. This girl also couldn't walk and crawled on all fours like a animal. Her name was Genie and she is still is alive and hasn't recovered. http://en.m.wikipedia.org/wiki/Genie_(feral_child)
This case was also similar to Victor or Aveyron, a feral child found roaming the French countryside in the early 1800's. The people of Averyron were terrorized by loud shrieks and screeches during the night, eventually they assembled a group of hunters to kill whatever was out there. The hunters found a boy(estimated to be around 12 years of age) covered in scars and naked in a tree. They found Victor during January with snow covering the ground, Victor had adapted to the cold and had a dense layer of fat around his body that were similar to penguins and seals. A man attemped to educate Victor, but as with Genie he only got so far. http://en.m.wikipedia.org/wiki/Victor_of_Aveyron
I find these articles extremely intresting. The brain will bend and mold like clay during the early years of a humans life, psychologists and sociologists have long debated the "Forbidden Experiment" which they would isolate a infant from all human contact to see what the default human nature exactly is. Not to mention how far the brain would evolve to surivive. Victor within 12 years developed a weathered, insulating layer of fat to combat the winter. That would take hundreds or even thousands of years for evolution to do the same task. The possibilities are endless.
What are your thoughts on the subject?
