Center versus periphery

Center versus periphery (方言, Hōgen-Shūken-Ron; lit. "Surrounding-zones dialect theory") is a linguistic theory put forward by Japanese folklorist Yanagita Kunio explaining the usage of certain words in a language used in some regions while not in others. The theory may also explain the existence of other cultural features, or lack thereof, in differing regions. However, it was specifically created to address linguistic differences.