The Dravidian family has defied all of the attempts to show a connection with other languages, including Indo-European, Hurrian, Basque, Sumerian, Korean and Japanese. Comparisons have been made not just with the other language families of the Indian subcontinent (Indo-European, Austroasiatic, Sino-Tibetan, and Nihali), but with all typologically similar language families of the Old World. Nonetheless, although there are no readily detectable genealogical connections, Dravidian shares strong areal features with the Indo-Aryan languages, which have been attributed to a substratum influence from Dravidian.