Joey is 3 years old. He correctly identifies himself as a boy and points to other boys saying, "they are like me". However, when he sees a man dressed as a female character in a theater performance, he insists that the man has "changed into a lady". His older sister, Clara, who is 7 years old, laughs and says, "He is still a man, he is just wearing a costume!"

Discuss cognitive explanations of gender development. Refer to Joey and Clara in your answer.