On screen text says, "Pairing social interactions with delivery of reinforcement". The teacher and student play with toy figurines. On screen text says, "Free access to reinforcement reduces the value of social interaction". The teacher uses toys and bubbles to stimulate interaction with the student, and the student continues to play by himself. The teacher blows the bubbles toward the student, and the student does not respond to her.

On screen text says, "Adult control and delivery of reinforcement increases the value of social interaction". The student joins the teacher to play and the teacher hands a toy to the student. The teacher continues to hand animal figurines from the box of toys to the student, naming each one. The student accepts them and places them in the toy jungle.