Exclusion and cognitive development

The last thing we learned in psychology class was that everything we learned in the class was based off of the culture we live in, for us its america. Since we live in a culture that prides itself on individual achievement versus group achievement like most Asian countries we interpenetrate things in a certain way. So what would happen if someone or some people grew up with out any outside cultural influence. By this i mean even more secluded than a tribe of people in the amazon lost in time. What if someone or a small group of two or three people were cut off from the rest of the world, how would they cognitively develop? In the summer of 1978 at the furthest reaches of the Siberian tundra lived one family.  The Lykov family had been found over 250 miles from the closest human settlement. The father Karp had witnessed a horrible atrocity during the rise of the soviet union and decided to literally grab his family and run for into the woods until he saw no sign of human inhabitant. Living only with the clothes off his back and two kettles Karp raised his family for forty years during the rise and fall of the soviet union. While out in the wilderness he had two daughters who, until being refound by a group of researchers in hunt for oil, had never even seen another human being outside of their mother father and brother. The scientist briefly described the families interactions between each other. As far as school the only written or reading material was a family bible.  The daughters used grunts and random noises to communicate mostly. I am curious to see how these humans cognitively developed. Did they understand time, space, direction? How and what did they learn and what view do they have on life?