Mittra E S, Fuentes A, McGrew W C
School of Medicine, Department of Anatomical Sciences, SUNY Stony Brook 11794, USA.
Am J Phys Anthropol. 1997 Aug;103(4):455-61. doi: 10.1002/(SICI)1096-8644(199708)103:4<455::AID-AJPA3>3.0.CO;2-M.
Although there is a vast literature on laterality of hand-use in nonhuman primates, the Colobinae have been notably overlooked. Ten manual activities of differing complexity were studied in five male and five female adult Hanuman langurs (Presbytis entellus) from a well habituated, wild population at Ramnagar, in southern Nepal. The activities recorded were carry, eat, hit, hold, idle, manipulate, reach, retrieve, self-groom and social groom. This study aimed to examine handedness across tasks and across subjects in a natural population. The overall result was a lack of preference for subjects and patterns. Only in the eating activity did four individuals show significant hand preference, though they were not unidirectional. Eat seemed to be loosely associated with hold due to the requirements of the strata which the monkeys utilize. These results suggest that hand use is unlateralized in P. entellus. Those individuals exhibiting some hand preferences can be viewed as statistical exceptions or perhaps subject to experiential differences. The results are discussed in terms of their evolutionary significance and methodological implications.
尽管关于非人类灵长类动物用手偏好的文献众多，但叶猴亚科却明显被忽视了。我们对来自尼泊尔南部拉姆纳加尔一个适应良好的野生种群的五只成年雄性和五只成年雌性哈努曼叶猴（食蟹猴）的十种不同复杂程度的手部活动进行了研究。记录的活动包括携带、进食、击打、握持、闲置、操作、够取、取回、自我梳理和社交梳理。本研究旨在考察自然种群中不同任务和不同个体的用手偏好。总体结果是个体和模式都缺乏偏好。只有在进食活动中，有四只个体表现出明显的用手偏好，不过并非单向的。由于猴子所利用的层级的要求，进食似乎与握持存在松散的关联。这些结果表明，食蟹猴的用手不存在单侧化。那些表现出一些用手偏好的个体可被视为统计学上的例外，或者可能受到经验差异的影响。我们从进化意义和方法学意义的角度对结果进行了讨论。
