A researcher shows 3-year-old Emilia two small boxes-a familiar crayon box and a plain, unmarked box. When the researcher asks Emilia to pick the box with the crayons in it, Emilia picks the familiar box. The researcher then shows Emilia that the familiar box is empty and the unmarked box contains crayons. Finally, the researcher introduces Emilia to a puppet named Betty and asks, "Where do you think Betty will look for the crayons?" The researcher is testing Emilia's grasp of __________.