The brain may become less lateralised and this in turn could result in left - handedness and the development of certain superior skills that have their origins in the left hemisphere such as logic , rationality and abstraction 大脑变得较少的横向并且这种转变导致用左手的习惯，某些高等能力源于左脑例如逻辑，理性和提取。
Study leader dr nick cherbuin from the australian national university concluded ： " these findings confirm our prediction of increasing efficiency of hemispheric interactions with increasing left - handedness . 领导这项研究的澳洲国立大学学者茄布恩博士总结道：这些发现证实我们的预测正确无误，即惯用左手倾向越强，脑左右半边之间的互动就越有效率。
Abstract : sixteen genetic traits were investigated in han and dong nationalities of hunan province . the frequencies of all the sixteen genetic traits and the gene frequencies of fourteen genetic traits except hand - clasping and arm - folding were calculated . the differences between two nationalities and those between male and female were ana - lyzed . the relations among handedness , hand - clasping and arm - folding were also analyzed 摘要本文对湖南汉族、侗族的16对遗传性状进行了调查.计算出了每对性状的出现率及除扣手和交叉臂外的14对遗传性状的基因频率,分析了民族间和性别间的差异,同时还分析了惯用手、扣手、交叉臂之间的关系。
Most of heredity modes of them , however , have not revealed . in order to resolve this problem , 72 families involving 1065 individuals in chifeng and huhhot areas , 1040 han students and their sibs and parents , and 41 pairs of twins in huhhot were investigated during 2001 to 2002 . the investigated index included 6 anthropological traits , i . e . rolling tongue , pointed tongue , twisting tongue , handedness , clasping hand and folding leg 为此，作者于2001 2002年分别对内蒙古赤峰市和呼和浩特市的72个家系中的1065人(男559人，女506人) ，呼和浩特市1040名汉族学生(男436名，女604名)及其父母和同胞，呼和浩特市41对双生子(男13对，女28对)进行了卷舌、尖舌、翻舌、利手、扣手和叠腿6项人类学特征的调查。
