Shared pattern of endocranial shape asymmetries among great apes, anatomically modern humans, and fossil hominins.
Shared pattern of endocranial shape asymmetries among great apes, anatomically modern humans, and fossil hominins.
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DOI：
10.1371/journal.pone.0029581
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发表时间：
2011
期刊：
影响因子：
3.7
通讯作者：
Grimaud-Hervé D
中科院分区：
文献类型：
--
作者：
Balzeau A;Gilissen E;Grimaud-Hervé D
人类大脑的解剖学不对称性是一个非常有趣的话题，因为它们与惯用手和认知功能有关。它们的出现和发生在人类化石记录中得到了广泛的探索，以记录大脑能力和行为的进化。我们第一次量化的前后endocranial形状不对称的大样本的类人猿，现代人类和化石古人类通过分析的“虚拟”3D模型的头骨和endocranial腔，我们统计测试偏离对称性。一旦基于连续变量，我们表明，这些大脑不对称的分析给出了原始的结果，建立在以前的分析基础上的离散特征。特别是，它出现的花瓣不对称的程度不同之间的大猿和人类没有修改他们的模式。我们确实证明了类人猿存在形状不对称，其模式与现代人类相似，但变化较小，波动不对称程度较低。更重要的是，当考虑人口分布时，左右半球额极和枕极位置的变化预计会显示出一定程度的反对称性，但观察到的样本间变化模式与花瓣大部分成分的波动不对称性有关。此外，存在一个共同的模式，显着的方向不对称的两个组成部分的petalias在人科动物暗示，所观察到的特征可能是遗传自现存的非洲大猿和智人的最后共同祖先。这些结果也有重要的意义，可能之间的关系，颅内形状不对称和功能能力的古人类。它强调了偏侧化活动（其中一些很可能是人属特有的）与大规模大脑偏侧化本身（并非人属特有的）之间的分离。
Anatomical asymmetries of the human brain are a topic of major interest because of their link with handedness and cognitive functions. Their emergence and occurrence have been extensively explored in human fossil records to document the evolution of brain capacities and behaviour. We quantified for the first time antero-posterior endocranial shape asymmetries in large samples of great apes, modern humans and fossil hominins through analysis of “virtual” 3D models of skull and endocranial cavity and we statistically test for departures from symmetry. Once based on continuous variables, we show that the analysis of these brain asymmetries gives original results that build upon previous analysis based on discrete traits. In particular, it emerges that the degree of petalial asymmetries differs between great apes and hominins without modification of their pattern. We indeed demonstrate the presence of shape asymmetries in great apes, with a pattern similar to modern humans but with a lower variation and a lower degree of fluctuating asymmetry. More importantly, variations in the position of the frontal and occipital poles on the right and left hemispheres would be expected to show some degree of antisymmetry when population distribution is considered, but the observed pattern of variation among the samples is related to fluctuating asymmetry for most of the components of the petalias. Moreover, the presence of a common pattern of significant directional asymmetry for two components of the petalias in hominids implicates that the observed traits were probably inherited from the last common ancestor of extant African great apes and Homo sapiens. These results also have important implications for the possible relationships between endocranial shape asymmetries and functional capacities in hominins. It emphasizes the uncoupling between lateralized activities, some of them well probably distinctive to Homo, and large-scale cerebral lateralization itself, which is not unique to Homo.
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影响因子：
5.3
作者：
Halpern, ME;Güntürkün, O;Rogers, LJ
通讯作者：
Rogers, LJ
影响因子：
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作者：
Balzeau, A;Grimaud-Hervé, D;Jacob, T
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影响因子：
5.7
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通讯作者：
WADA, JA