 However, this has largely been rejected by other linguists.The sound correspondences between Old Chinese and Proto-Austronesian can also be explained as a result of the Longshan interaction sphere, when pre-Austronesians from the Yangtze region came into regular contact with Proto-Sinitic speakers in the Shandong Peninsula at around the 4th to 3rd millennia BCE.This corresponded with the widespread introduction of rice cultivation to Proto-Sinitic speakers and conversely, millet cultivation to Pre-Austronesians.