Video_S1-Twotubes-Visible

Video S1: Two tubes condition—Visible baiting. In the experimental demonstration, E1 lifts up the two tubes, taps them against each other to show they are empty, and then places them in the v-shaped configuration on the ground in front of the occluder. She then picks up a fake fruit with her right hand and appears to place this fruit on the right distal side opening of one of the tubes (baiting hand and side was counterbalanced across monkeys). She then picks up the occluder and walks away so that the monkey can approach; in the real study she moved behind the camera person (E2). In the example response clip, the monkey approaches and looks in the right side. Note that orientation of video switches: in the demonstration it shows the monkey’s perspective, whereas in the example test clip E2 is behind E1 while she does the demonstration.