Dunham Leslie A, Hopkins William D
Division of Psychobiology, Yerkes National Primate Research Center, Atlanta, GA 30322, USA.
Behav Neurosci. 2006 Oct;120(5):1025-32. doi: 10.1037/0735-7044.120.5.1025.
Findings suggest that in humans, sex and hand preference may be associated with the size of the corpus callosum (CC). The authors measured CC morphology from MRIs in 67 chimpanzees (Pan troglodytes) to see whether similar effects were present in this species. Hand preference was assessed by performance on 4 tasks, and chimpanzees were classified as left-handed, right-handed, or ambidextrous. In a subsequent analysis, the chimpanzees were reclassified into 2 groups: right-handed and left-handed. The results revealed no sex difference in CC area, but significant effects of hand preference were found for several CC regions (rostrum body, anterior midbody, posterior midbody, isthmus, and splenium) and for overall CC size, with left-handed chimpanzees exhibiting significantly smaller CC measurements than right-handed chimpanzees. The results indicate that lateralized hand use in chimpanzees, as in humans, is associated with variation in CC size.
研究结果表明，在人类中，性别和用手偏好可能与胼胝体（CC）的大小有关。作者测量了67只黑猩猩（Pan troglodytes）MRI中的CC形态，以观察该物种是否存在类似影响。通过4项任务的表现评估用手偏好，黑猩猩被分为左撇子、右撇子或双手灵巧。在随后的分析中，黑猩猩被重新分为两组：右撇子和左撇子。结果显示，CC区域不存在性别差异，但在几个CC区域（嘴部、前中部、后中部、峡部和压部）以及整个CC大小方面发现了用手偏好的显著影响，左撇子黑猩猩的CC测量值明显小于右撇子黑猩猩。结果表明，与人类一样，黑猩猩的用手偏侧化与CC大小的变化有关。
