Chiu H C, Damasio A R
J Neurol Neurosurg Psychiatry. 1980 Oct;43(10):873-8. doi: 10.1136/jnnp.43.10.873.
The handedness of seventy-five persons without evidence of neurological disease, was assessed with a standardised test. An analysis of the CT scans of the same persons was performed to determine (1) presence and lateralisation of frontal and occipital "petalia," (2) width of frontal and occipital lobes of each hemisphere, (3) direction of straight sinus deviation. Results suggest that handedness and cerebral asymmetries are independent variables. There were no significant differences between right-handers and non-right-handers. Also there were no significant differences between strongly left-handed and ambidextrous individuals, nor were there differences between right-handers with or without family history of left-handedness. Irrespective of handedness, left occipital "petalia" was more common than right (p < 0.01), right frontal petalia was more common than left (p < 0.01), and straight sinus deviation was more commonly toward the right. The study does not support the concept that cerebral "symmetry" or "reverse asymmetry" are associated with left-handedness or ambidexterity. The noted asymmetries are more likely to be direct correlates of cerebral language dominance, than of handedness. Furthermore, the possibility that outside forces acting on the bone contributes to the asymmetries cannot be excluded. CT scan may be of value as a direct predictor of cerebral dominance.
对75名无神经疾病证据的人的用手习惯进行了标准化测试评估。对同一批人的CT扫描图像进行分析，以确定：(1) 额叶和枕叶“蝶形脑回”的存在及偏侧化情况；(2) 每个半球额叶和枕叶的宽度；(3) 直窦偏移方向。结果表明，用手习惯和大脑不对称是独立变量。右利手者和非右利手者之间没有显著差异。强左利手者和双手同利者之间也没有显著差异，有或没有左利手家族史的右利手者之间同样没有差异。无论用手习惯如何，左侧枕叶“蝶形脑回”比右侧更常见（p < 0.01），右侧额叶蝶形脑回比左侧更常见（p < 0.01），且直窦偏移更常见于右侧。该研究不支持大脑“对称”或“反向不对称”与左利手或双手同利相关的概念。所观察到的不对称更可能是大脑语言优势的直接相关因素，而非用手习惯。此外，不能排除作用于骨骼的外力导致这些不对称的可能性。CT扫描作为大脑优势的直接预测指标可能具有价值。
