科学家一直在试图解释为什么存在左撇子和右撇子的差异,几十年来的主流观点都认为,其根源在于大脑不同。不过,德国波鸿鲁尔大学最新研究显示,大脑不是决定用手习惯的唯一因素,脊椎神经可能也是重要原因。研究人员分析了5个胎儿在发育8~12周时,脊髓神经中的基因表达情况。结果显示,在8周左右,胎儿 Scientists have been trying to explain why there are differences between left-handed and right-handed, and the mainstream opinion for decades has been that the root cause is different brains. However, a recent study by the Ruhr University in Bochum, Germany, shows that the brain is not the only factor that determines the habit of using the hand, and spinal nerves may also be an important reason. The researchers analyzed the gene expression of spinal nerves in five fetuses at 8-12 weeks of development. The results showed that in about 8 weeks, the fetus