Figure 1.

Design of the experimental apparatus for the Choice test (A) and the Isolation/Reunion test (B). For the Choice test between Object and Human (A), each pig remained in the trolley for 30 s before entering the room where it was left for 5 min. For the Isolation/Reunion test (B), the pig was left alone for 5 min (Isolation phase), and then remained for 4 min and 30 s (Reunion phase) either alone, with the familiar inanimate Object or with the familiar Human, on different days. Proximal zones: blue solid lines were drawn to identify the zones in which the pig was considered close to the stimulus. The distant zone (B) was drawn to identify a zone where the pig was considered distant from the stimulus. Virtual zones were drawn to monitor the location and mobility of the pig in the room (gray dotted lines).