Papuan people
Genetically, while Aboriginal Australians are most closely related to Melanesian and Papuan people, there is also another component that could indicate South Asian admixture or more recent European influence. Research indicates a single founding Sahul group with subsequent isolation between regional populations which were relatively unaffected by later migrations from the Asian mainland, which may have introduced the dingo 4–5,000 years ago. The research also suggests a divergence from the Papuan people of New Guinea and the Mamanwa people of the Philippines about 32,000 years ago, with a rapid population expansion about 5,000 years ago. A 2011 genetic study found evidence that the Aboriginal, Papuan and Mamanwa peoples carry some of the alleles associated with the Denisovan peoples of Asia, (not found amongst populations in mainland Asia) suggesting that modern and archaic humans interbred in Asia approximately 44,000 years ago, before Australia separated from New Guinea and the migration to Australia. A 2012 paper reports that there is also evidence of a substantial genetic flow from India to northern Australia estimated at slightly over four thousand years ago, a time when changes in tool technology and food processing appear in the Australian archaeological record, suggesting that these may be related.