Dadda Marco, Cantalupo Claudio, Hopkins William D
Department of General Psychology, University of Padova, Via Venezia 8, 35131 Padova, Italy.
Neuropsychologia. 2006;44(12):2582-6. doi: 10.1016/j.neuropsychologia.2006.03.037. Epub 2006 May 26.
The neurobiology of handedness is still poorly understood in nonhuman primates. Recently, an association between hand preference and precentral gyrus morphology in chimpanzees was reported. The aim of this study was to further evaluate the association between handedness and asymmetries in the precentral gyrus of chimpanzees (Pan troglodytes) and to evaluate the association between hand preference and brain asymmetry using a different approach to the classification of handedness in chimpanzees. The overall results suggest that differences in handedness groups are specific to a region of the precentral gyrus commonly known as the "knob" and that subjects that show different hand preferences differ in brain asymmetries for specific regions of the primary motor cortex. Moreover, using a continuous scale of measurement rather than discrete classification of handedness, significant associations were found between hand use and asymmetries within the precentral gyrus.
在非人类灵长类动物中，利手的神经生物学仍未得到充分理解。最近，有报道称黑猩猩的手偏好与中央前回形态之间存在关联。本研究的目的是进一步评估黑猩猩（Pan troglodytes）中央前回中利手与不对称性之间的关联，并使用一种不同的黑猩猩利手分类方法来评估手偏好与脑不对称性之间的关联。总体结果表明，利手组之间的差异特定于中央前回中一个通常被称为“旋钮”的区域，并且表现出不同手偏好的个体在初级运动皮层特定区域的脑不对称性方面存在差异。此外，使用连续的测量尺度而非利手的离散分类，发现手的使用与中央前回内的不对称性之间存在显著关联。
