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绝大多数儿童习惯用右手,也有一些孩子用左手。后者被叫做“左撇子”。一、左撇子因何而来?左撇子从何而来?原因很复杂,目前仍是科学界尚未揭开的谜之一。世界上将近2/3的左撇子为男性,而且有遗传性。有关研究表明:父母双方都是左撇子,其子女肯定有半数也是左撇子。但是,左撇子又并非完全是遗传所致。因为至少有84%的左撇子其父母是右撇子;12%的孪生孩子中,一为右撇子,另一个为左撇子。美国哈佛医学院的一位神经病学家研究指出:左撇子是因睾丸激素太多或胎儿对睾丸激素太过敏
The vast majority of children are accustomed to using their right hand, there are some children with their left hand. The latter is called “left-handed”. First, the left-handed come from? Left-handed come from? The reason is very complex, is still the science has not yet opened one of the mysteries. Nearly two-thirds of the world’s left-handers are male and hereditary. The study shows that: both parents are left-handed children, and certainly half of their children are also left-handed. However, left-handed people are not entirely genetic. Because at least 84% of left-handed parents are right-handed; 12% of twin children are right-handed and left-handed. A neurologist at Harvard Medical School in the United States pointed out that: left-handed is due to too much testosterone or fetal hypersensitivity to testosterone