Laboratory of Applied Ethology, Department of Comparative Biomedicine and Food Science, University of Padua, Viale dell'Università 16, 35020, Legnaro, Italy.
Laboratory of Applied Ethology, Department of Comparative Biomedicine and Food Science, University of Padua, Viale dell'Università 16, 35020, Legnaro, Italy.
Behav Processes. 2021 Aug;189:104425. doi: 10.1016/j.beproc.2021.104425. Epub 2021 May 16.
Few studies have investigated biological motion perception in dogs and it remains unknown whether dogs recognise the biological identity of two-dimensional animations of human motion cues. To test this, we assessed the dogs' (N = 32) responses to point-light displays of a human performing a pointing gesture towards one of two pots. At the start of the experiment the demonstrator was a real-life person, but over the course of the test dogs were presented with two-dimensional figurative representations of pointing gestures in which visual information was progressively removed until only the isolated motion cues remained. Dogs' accuracy was above chance level only with real-life and black-and-white videos, but not with the silhouette or the point-light figure. Dogs' accuracy during these conditions was significantly lower than in the real-life condition. This result could not be explained by trial order since dogs' performance was still not higher than chance when only the point-light figure condition was presented after the initial demonstration. The results imply that dogs are unable to recognise humans in two-dimensional depictions of human motion cues only. In spite of extensive exposure to human movement, dogs need more perceptual cues to detect equivalence between human two-dimensional animations and the represented living entity.
很少有研究调查过狗对生物运动感知的能力，也不清楚狗是否能识别人类运动线索的二维动画中的生物身份。为了测试这一点，我们评估了狗（N=32）对指向手势的光点显示的反应，该手势指向两个罐子中的一个。在实验开始时，演示者是一个真人，但在测试过程中，狗被呈现出二维的具象化指向手势，这些手势的视觉信息逐渐被移除，直到只剩下孤立的运动线索。只有在真实生活和黑白视频中，狗的准确率才高于随机水平，而在剪影或光点人物中则不然。在这些情况下，狗的准确率明显低于真实生活条件下。由于当只呈现光点人物条件时，即使在初始演示之后，狗的表现仍然没有高于随机水平，因此这个结果不能用试验顺序来解释。研究结果表明，狗无法仅通过二维的人类运动线索的描绘来识别人类。尽管狗广泛接触过人类的运动，但它们需要更多的感知线索来检测人类二维动画和代表的实体之间的等同性。
