According to Alberts, Elkind, and Ginsberg the personal fable "is the corollary to the imaginary audience. Thinking of himself or herself as the center of attention, the adolescent comes to believe that it is because he or she is special and unique". It is found during the formal operational stage in Piagetian theory, along with the imaginary audience. Feelings of invulnerability are also common. The term "personal fable" was first coined by the psychologist David Elkind in his 1967 work "Egocentrism in Adolescence".