A study at the University of Washington's Institute for Learning and Brain Sciences took a sample of 64 18-month-old babies, who were all tested individually. The experimental test had the babies sit on their parents' laps, facing a remote-controlled humanoid robot. Sitting next to the robot was Rechele Brooks, one of the researchers on the study. Brooks and the robot (controlled remotely by an unseen researcher) would then engage in a 90-second skit, in which Brooks interacted with the robot as if it was a child, asking questions like "Where is your tummy?" and "Where is your head?" The robot would in turn point to its different parts. The robot would also imitate a few arm movements, like waving back and forth.