In a hypothesis developed by Wilhelm Solheim, the Nusantao Maritime Trading and Communication Network (NMTCN) is a trade and communication network that first appeared in the Asia-Pacific region during its Neolithic age, or beginning roughly around 5000 BC.
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Theories such as Wilhelm Solheim's Nusantao Maritime Trading and Communication Network (NMTCN) suggest that cultural links between what are now China and the nations of Southeast Asia, including what is now the Philippines, date back to the peopling of these lands.
Wilhelm Solheim's concept of the Nusantao Maritime Trading and Communication Network (NMTCN), while not strictly a theory regarding the biological ancestors of modern Southeast Asians, does suggest that the patterns of cultural diffusion throughout the Asia-Pacific region are not what would be expected if such cultures were to be explained by simple migration.