Pay and bonuses are extrinsic motivators: They appeal to a person's desire to attain a goal that is distinct from the work itself. But to encourage your group's creativity, you should augment extrinsic motivators with intrinsic motivators, such as challenging assignments. Intrinsic motivators appeal to a person's desire for self-actualization or challenge, deep interest and involvement in the work, or curiosity or sense of enjoyment.