A migratory model regarding the spread of ancient culture—e.g., from Africa, across Europe—which modifies the general diffusion theory, by postulating that farmers advanced at a rate of 1 km/year, assimilating the hunter-gatherer gene pool
But while demic diffusion may have predominated, it is equally important to assess the involvement, different for each place and time, of indigenous hunter-gatherers who adopted farming through contact with colonising farmers.
2000), much of which supports an acculturation model--and therefore challenges the demic diffusion hypothesis of Ammerman & Cavalli-Sforza (1984), which had only a very small number of dates to refer to.
The authors note similarities between the people of Ban Chiang and the latter group and the Ainu people, and pay no heed to the weight of linguistic or archaeological evidence that, in fact, supports the hypothesis for demic diffusion.
The demic diffusion model for the spread of agriculture as proposed by Ammerman & Cavalli-Sforza (1971; 1984: 63-84) suggested that early farming populations expanded into southeastern Europe gradually at the front of a wave-of-advance.
In this paper we argue that agriculture arrived in southeastern Europe by demic diffusion and present a major modification of Ammerman & Cavalli Sforza's (1984: 6) wave-of-advance model for this process.