Test Setup (IMAGE)
Caption
The test apparatus involved a barrier separating the participants from a food reward, with two openings on opposite ends that were controlled by a researcher. When the first animal approached an opening, the door before it would shut while the opposite door remained open, allowing the partner to enter first and access the food. The door then remained open, so that other animal could then enter. Thus the animals had to cooperate in two ways - first by positioning themselves on opposite ends of the barrier and then by timing and coordinating their approaches towards the barrier.
Credit
Image: Sylvio Tüpke
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