The Mood Wheel id s concept developed in 1936 by Kate Hevner, a psychologist at Ohio State University. It was designed to illustrate the mood responses of humans to musical themes. Henver originally arranged eight mood clusters identifying certain key words to describe moods as they relate to one another. Thus, if one chooses music that portrays their present mood, it is possible to gradually proceed around the circle in either direction between cheerfulness and sadness, listening to a series of sequentially mood-altering selections. Utilizing music in this way makes it possible to change one's mood incrementally in the direction described through a process known as entrainment. In 2003, Hevner's creation was updated and improved by Emery Schubert of the University of South Whales in Australia.