Central Thailand
According to Glottochronology data, speakers of Aslian languages appeared in the Malay Peninsula, dating from about 3,800 to 3,700 years ago. This is consistent with the peninsula ceramic tradition of Ban Kao from Central Thailand. During 2,800-2,400 years ago, the differentiation of the North Aslian language, Central Aslian languages and Southern Aslian languages began to developed. It is not known what languages the local population used to speak, but it has also changed to Aslian languages.