Concepts of cultural diffusion used to explain rock ’n’ roll. Culture hearths Diffusion modes Carriers Barriers Culture change Culture hearths are hotbeds for culture trait development. . Mayan Inca A culture hearth is a crossroads where ideas are exchanged and culture traits developed. Diffusion moves culture traits from hearths to other places. Triangle Trade Over time, some culture hearths may decline as new ones ascend. Diffusion modes Relocation diffusion Expansion diffusion Hierarchical Contagious Relocation diffusion occurs when people move to a new location and do not return. Music was one African culture trait to survive the slave trade. Expansion diffusion moves traits to a new place where they are introduced to new people and expanded. Chicago Blues The Blues Mississippi Delta Blues Expansion diffusion can be hierarchical and move from higher to lower ranked places. Paris New York City Diffusion of fashion Minneapolis/St. Paul Expansion diffusion can be contagious as it spreads from a central point. New York City Music diffusion Nashville - WLAC Memphis, Tenn. Carriers Carriers move culture traits. Human migration, trade and travel have been the most common carriers. Trade 45 rpm records Transistor radio 33 1/3 rpm records 8 Track Tape Technological advances impact the scope and speed of diffusion. Internet downloads mp3 players CD’s Cassette tapes Networking sites Barriers block diffusion. Geographic barriers Cultural barriers Physical features Geographic barriers stop or slow down cultural diffusion. Distance and accessibility: “Backwoods is backwards.” Cultural barriers stop or alter diffused culture traits. Religious Political Cultural barriers stop or alter diffused culture traits. Social Culture change takes place when traits are adopted, adapted or imposed. Saudi Arabia China Korea