Rhine Ramon J, Norton Guy W, Westlund Bruce J
Department of Psychology, University of California, Riverside.
Am J Primatol. 1984;7(3):213-228. doi: 10.1002/ajp.1350070302.
Development toward independence during the early years of baboon life is reflected in the infant's transition from riding on its mother to walking on its own during progressions from one location to another. This transition was studied during the first year of life in 55 infants from two differently sized troops living in Mikumi National Park, Tanzania. There was a nearly linear transition in the first year from almost 100% ventral riding to almost 100% walking. The amount of dorsal riding started near zero, reached a plateau lasting from about the 15th to the 26th wk of life, and then gradually declined to zero. Dorsal riding did not replace ventral; rather, dorsal riding increased in frequency until it occurred about as often as ventral riding. Prolonged ventral riding by infants of the smaller of the two troops may have been due to spacing differences or to greater nervousness among members of the smaller troop. There were no significant differences in riding or walking associated with the time of day or the infant's sex. The rate of transition from riding to walking was greatest from about the fifth to the seventh months, which may be especially significant time in the early development of independence.
狒狒幼年时期向独立发展的过程体现在婴儿从骑在母亲身上到在从一个地方移动到另一个地方的过程中独自行走的转变上。在坦桑尼亚米库米国家公园生活的两个不同规模群体的55只婴儿狒狒的第一年生活中，对这种转变进行了研究。在第一年中，从几乎100%的腹面骑乘到几乎100%的行走存在近乎线性的转变。背面骑乘的次数开始时接近零，在大约第15周到第26周的生命期间达到一个平台期，然后逐渐下降到零。背面骑乘并没有取代腹面骑乘；相反，背面骑乘的频率增加，直到它与腹面骑乘出现的频率大致相同。两个群体中较小群体的婴儿长时间腹面骑乘可能是由于空间差异或较小群体成员中更大的紧张情绪。与一天中的时间或婴儿的性别相关的骑乘或行走没有显著差异。从骑乘到行走的转变速度在大约第五到第七个月最快，这在独立早期发展中可能是特别重要的时期。
