Tan U
Ataturk University, Medical Faculty, Institute of Physiology, Erzurum, Turkey.
Int J Neurosci. 1988 Dec;43(3-4):183-7. doi: 10.3109/00207458808986168.
Under psycho motor hypothesis, the relationship between left-handedness and nonverbal intelligence was studied in left-handed male and female subjects. Handedness was assessed by the Edinburgh Handedness Questionnaire; Geschwind scores (GS) were calculated for each subject. A GS of - 100 indicated consistent left-handedness. Spatial reasoning (nonverbal intelligence) was assessed by the Cattle's Culture Fair Intelligence Test. In the male and female subjects, the IQs increased for GSs from weak up to moderate left-handedness (GSs: -5 to -60), and decreased from moderate up to strong left-handedness (GSs: -60 to -100) linearly; the regression coefficient were found to be statistically significant. Weak-, and strong left-handedness both were associated with lowest scores; the highest scores were found in the subjects with moderate left-handedness (GSs: -55 to -65). It was concluded that the prerequisite for well-developed spatial reasoning should be two-sided development of the brain instead of one-sided dominance, and well functioning parallel processing between two cerebral hemispheres.
在心理运动假说的框架下，针对左利手男性和女性受试者，研究了左利手与非言语智力之间的关系。利手情况通过爱丁堡利手问卷进行评估；为每个受试者计算了 Geschwind 分数（GS）。GS 为 -100 表示持续的左利手。空间推理（非言语智力）通过瑞文标准推理测验进行评估。在男性和女性受试者中，智商随着 GS 从弱左利手到中度左利手（GS：-5 至 -60）而增加，从中度左利手到强左利手（GS：-60 至 -100）则呈线性下降；发现回归系数具有统计学意义。弱左利手和强左利手均与最低分数相关；中度左利手（GS：-55 至 -65）的受试者得分最高。研究得出结论，空间推理能力良好发展的前提应该是大脑的双侧发展而非单侧优势，以及两个大脑半球之间良好的并行处理功能。
