Southeast Asia is characterized by its cultural diversity. In few extensions of territory you will be able to find different languages, races and cultures. Although all comes from a same trunk. Astronesian is the root of most of the population of Indonesia.
It is precisely in Indonesia where the first vestiges of homo sapiens are. It makes approximately 10 million years Sumatra was separated from the continent and it was precisely that division that allowed the human evolution.
As far as 4.000 years before Christ these inhabitants arrived to it is today known as Taiwan, and continued spreading towards Malaysia, Polynesia, New Zealand, Hawaii, Madagascar and this of Africa.
It is certain that compared with other zones of the archipelago Hindu the inhabitants of the Mentawai have had a small contact with other societies and cultures. Although the colonial period and post colonial has accelerated the process of cultural change. In other words: globalización
In that sense, the present inhabitants of the Mentawai are, in certain way, still primitive. Or rather primitive relics, living legend of the past. True treasures of the humanity.