The Creatures are a successful rock band with three hit albums to their credit. They begin their U.S.tour featuring many new, unreleased songs, all of which draw silence from their concert fans. The same fans cheer wildly when the Creatures play any of their old hits. Gradually, the band reduces the number of new songs it plays and starts playing more of the old standbys.
Operant conditioning. Playing new songs leads to negative consequences (punishment), which weaken the tendency to play new songs. Playing old songs leads to positive reinforcement, which gradually strengthens the tendency to play old songs.