Fig. 1 | Animal Cognition

Fig. 1

From: Behavioural coordination of dogs in a cooperative problem-solving task with a conspecific and a human partner

Fig. 1

a Testing apparatus from the front. A box with a clear Perspex top and front was positioned on stools. At the front, the Perspex had an aperture. Inside the box, the experimenter positioned a platform with weights (black circles in the picture) and cylinders as well as notches in which food could be placed. A rope was positioned around the cylinders, and the rope ends were hung through the aperture at the front of the box. By pulling on both rope ends, the platform could be pulled forward such that the food fell on the ground. The weights were used because without them the platform was too light and thus pulling on one rope end alone produced enough friction to pull the platform into reach. b Testing apparatus from the back. The back of the box could be opened by the experimenter to position the platform, rope and food. c The ‘cooperation’ platform with two notches in which food could be placed, two weights (black round circles in the picture), two cylinders and a rope that was placed around them. This platform was used in the test phase of the experiment. d The ‘alone’ platform with one notch in which food could be placed, two weights (black round circles in the picture), one cylinder and a rope that was placed around it. This platform was used during the training phase and the transfer task at the end of training

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