Human walking involves out‐of‐phase axial rotations of the thorax and pelvis. It has long been believed that this rotational capability is a distinctive feature of the genus Homo. However, Thompson et al. (2015) showed that chimpanzees also counter‐rotate their thorax relative to the pelvis during bipedal walking, which raised questions regarding the origins and development of this characteristic. In this study, we measured the axial rotation of the trunk during bipedal walking in humans and macaques to investigate if intra‐trunk axial rotations are observed in non‐hominoid primate species.

中文翻译：

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人类和日本猕猴双足行走时躯干轴向旋转的比较。

人的行走涉及胸部和骨盆的异相轴向旋转。长期以来，人们一直相信这种旋转能力是Homo属的一个独特特征。然而，汤普森等。（2015年）表明，黑猩猩在双足行走过程中也使它们的胸部相对于骨盆反向旋转，这引发了对该特征起源和发展的质疑。在这项研究中，我们在人和猕猴的双足行走过程中测量了躯干的轴向旋转，以研究在非类人灵长类动物中是否观察到树干内部的轴向旋转。