Feral children.

The last in a series of four programmes looking at some of the more unexpected workings of the mind. This part features feral children - are they the natural experiment that allows us to confront the nature / nurture debate? The programme is focused around the story of 13-year-old Oxana Malaya who, at 3-years-old, was left to sleep with the family pet dogs as her parents were alcoholics. By the time she was 8 she was behaving more like a dog than a human - we see how she has progressed since then. Other stories include the harrowing tale of Jeannie Wiley in the 1970s who for 13 years was kept in silence in a dark room, strapped into a potty chair by day and left to sleep in a chicken wire cage by night. We also see archive footage of Kellogg's experiments with a monkey companion for his baby son and Harry Harlow's experiments on monkeys. The programme ends as Oxana is reunited with her father and one of her sisters.