Photos of the child and the adult models were displayed, one on each monitor. E said, ‘‘All of our
games today involve getting the Gibbon out of things. It is my turn first.” The experimenter used a simple
warm-up task to help explain that when the child gets the token out, the child is rewarded with a
sticker. E placed the token in a tin and closed the lid, reopened the lid, and took the token out, saying,
‘‘That’s a sticker for me.” She then placed the token back into the tin, closed the lid, and put the tin
down on the child’s side of the table, saying, ‘‘Now it’s your turn.” Once the child removed the token
from the tin, E said, ‘‘Well done, that’s a sticker for you. Let’s start you a pile.”