The original language of the Veddas is the Vedda language, which today is used primarily by the interior Veddas of Dambana. Communities such as Coast Veddas and Anuradhapura Veddas, who do not identify themselves strictly as Veddas, also use Vedda language for communication during hunting and or for religious chants. When a systematic field study was conducted in 1959 it was determined that the language was confined to the older generation of Veddas from Dambana. In the 1990s, self-identifying Veddas knew few words and phrases in the Vedda language, but there were individuals who knew the language comprehensively. Initially, there was considerable debate among linguists as to whether Vedda is a dialect of Sinhala or an independent language. Later studies indicate that it diverged from its parent stock in the 10th century and became a Creole and a stable independent language by the 13th century, under the influence of Sinhala.