Motor skill for tool-use is associated with asymmetries in Broca's area and the motor hand area of the precentral gyrus in chimpanzees (Pan troglodytes).
Motor skill for tool-use is associated with asymmetries in Broca's area and the motor hand area of the precentral gyrus in chimpanzees (Pan troglodytes).
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DOI：
10.1016/j.bbr.2016.10.048
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发表时间：
2017-02-01
影响因子：
2.7
通讯作者：
Schapiro SJ
中科院分区：
文献类型：
--
作者：
Hopkins WD;Meguerditchian A;Coulon O;Misiura M;Pope S;Mareno MC;Schapiro SJ
在非人类灵长类动物中，黑猩猩以其复杂性和在圈养和野外使用工具的多样性而闻名。工具制造和使用的进化被认为是大脑尺寸、复杂认知和运动技能以及现代人类中观察到的群体水平的惯用手发展的驱动机制。尽管如此，我们对黑猩猩和其他灵长类动物使用工具的神经学相关性的理解仍然知之甚少。在这里，我们评估了黑猩猩的手的偏好和性能技能的工具使用任务，并将这些数据与额下回（IFG）和pli-de-passage额顶叶moyen（PPFM）的神经解剖学不对称的措施。IFG是黑猩猩大脑中布罗卡区的同源物，PPFM是连接中央前回和中央后回的埋藏回，对应于中央前回的运动手区。我们发现，用右手比用左手更好地完成任务的黑猩猩在IFG和PPFM中表现出更大的不对称性。这种手的性能和PPFM不对称之间的关联是特别强大的右撇子个人。基于这些发现，我们认为工具使用的进化与左半球运动技能专业化的增加有关。我们进一步认为，偏侧化的运动规划，而不是手的偏好本身，选择与工具的制造和使用在人科进化。
Among nonhuman primates, chimpanzees are well known for their sophistication and diversity of tool use in both captivity and the wild. The evolution of tool manufacture and use has been proposed as a driving mechanism for the development of increasing brain size, complex cognition and motor skills, as well as the population-level handedness observed in modern humans. Notwithstanding, our understanding of the neurological correlates of tool use in chimpanzees and other primates remains poorly understood. Here, we assessed the hand preference and performance skill of chimpanzees on a tool use task and correlated these data with measures of neuroanatomical asymmetries in the inferior frontal gyrus (IFG) and the pli-de-passage fronto-parietal moyen (PPFM). The IFG is the homolog to Broca’s area in the chimpanzee brain and the PPFM is a buried gyrus that connects the pre- and post-central gyri and corresponds to the motor-hand area of the precentral gyrus. We found that chimpanzees that performed the task better with their right compared to left hand showed greater leftward asymmetries in the IFG and PPFM. This association between hand performance and PPFM asymmetry was particularly robust for right-handed individuals. Based on these findings, we propose that the evolution of tool use was associated with increased left hemisphere specialization for motor skill. We further suggest that lateralization in motor planning, rather than hand preference per se, was selected for with increasing tool manufacture and use in Hominid evolution.