Primates

, Volume 46, Issue 1, pp 11–19

Kinematic analysis of bipedal locomotion of a Japanese macaque that lost its forearms due to congenital malformation

  • Naomichi Ogihara
  • Hiraku Usui
  • Eishi Hirasaki
  • Yuzuru Hamada
  • Masato Nakatsukasa
Original Article

DOI: 10.1007/s10329-004-0100-1

Cite this article as:
Ogihara, N., Usui, H., Hirasaki, E. et al. Primates (2005) 46: 11. doi:10.1007/s10329-004-0100-1

Abstract

Spontaneously acquired bipedal locomotion of an untrained Japanese monkey (Macaca fuscata) is measured and compared with the elaborated bipedal locomotion of highly trained monkeys to assess the natural ability of a quadrupedal primate to walk bipedally. The subject acquired bipedalism by himself because of the loss of his forearms and hands due to congenital malformation. Two other subjects are performing monkeys that have been extensively trained for bipedal posture and locomotion. We videotaped their bipedal locomotion with two cameras in a lateral view and calculated joint angles (hip, knee, and ankle) and inertial angle of the trunk from the digitized joint positions. The results show that all joints are relatively more flexed in the untrained monkey. Moreover, it is noted that the ankle is less plantar flexed and the knee is more flexed in mid-to-late stance phase in the untrained monkey, suggesting that the trunk is not lifted up to store potential energy. In the trained monkeys, the joints are extended to bring the trunk as high as possible in the stance phase, and then stored potential energy is exchanged for kinetic energy to move forward. The efficient inverted pendulum mechanism seems to be absent in the untrained monkey’s locomotion, implying that acquisition of such efficient bipedal locomotion is not a spontaneous ability for a Japanese monkey. Rather, it is probably a special skill that can only be acquired through artificial training for an inherently quadrupedal primate.

Keywords

Macaca fuscataBipedal locomotionJoint anglesTrainingMonkey performance

Copyright information

© Japan Monkey Centre and Springer-Verlag 2005

Authors and Affiliations

  • Naomichi Ogihara
    • 1
  • Hiraku Usui
    • 2
  • Eishi Hirasaki
    • 3
  • Yuzuru Hamada
    • 4
  • Masato Nakatsukasa
    • 1
  1. 1.Laboratory of Physical Anthropology, Department of Zoology, Graduate School of ScienceKyoto UniversityKyoto 606-8502Japan
  2. 2.Graduate School of Asian and African Area StudiesKyoto UniversityKyotoJapan
  3. 3.Laboratory of Biological Anthropology, Graduate School of Human SciencesOsaka UniversitySuitaJapan
  4. 4.Primate Research InstituteKyoto UniversityInuyamaJapan