Apparatus used in Experiments 1–5.

<p>A depiction of the experimental setup used in Experiments 1–5, consisting of the blicket detector (left) and testing chamber (right). The blicket detector contained a platform for placing objects (location indicated by the red dumbbell), toy dog that lit up and made a sound when blickets were placed on the machine, and an inclined ramp “grape dispenser” that provided monkeys with a food reward when blickets were placed on the machine.