In psychology, egocentrism is efined as a) the incomplete differentiation of the self and the world, including other people and b) the tendency to perceive, understand and interpret the world in terms of the self. The term derives from the Greek egô, meaning "I". An egocentric person has no theory of mind, cannot "put himself in other people's shoes," and believes everyone sees what he sees (or that what he sees in some way exceeds what others see.)