Tan U
Atatürk University, Medical Faculty, Institute of Physiology, Erzurum, Turkey.
Int J Neurosci. 1991 Jun;58(3-4):151-5. doi: 10.3109/00207459108985430.
The relationship between the strength of left-handedness and spatial reasoning ability was studied in left-handed male and female subjects with and without familial sinistrality (FS). The degree of left-handedness was assessed by the Edinburgh Handedness Inventory. The spatial reasoning ability was measured by Cattell's Culture Fair Intelligence Test. It was found that there was a negative linear correlation between nonverbal IQ and the strength of left-handedness in females with and without FS, a quadratic relationship in male left-handers without FS and a positive linear correlation in male left-handers with FS. These results indicate that the brain may exhibit different patterns of cerebral organization in left-handers to sex and FS. It was concluded that the "crowding" hypothesis may apply only to a subgroup of left-handers, i.e., females with a greater bilaterality of cognitive functions than males.
在有或没有家族性左利手（FS）的左利手男性和女性受试者中，研究了左利手程度与空间推理能力之间的关系。通过爱丁堡利手量表评估左利手程度。通过卡特尔文化公平智力测验测量空间推理能力。结果发现，在有或没有FS的女性中，非言语智商与左利手程度呈负线性相关；在没有FS的男性左利手者中呈二次关系；在有FS的男性左利手者中呈正线性相关。这些结果表明，左利手者的大脑在性别和FS方面可能表现出不同的脑组织结构模式。得出的结论是，“拥挤”假说可能仅适用于左利手者的一个亚组，即认知功能双侧性比男性更强的女性。
