左撇子影響身心健康

　　With just 10% of the population being left-handed, it can be easy for everyone else to forget we're living in a right-handed world. But aside from making it tough to cut a straight line with a pair of scissors designed for righties, being a southpaw can also have some subtle effects on our physical and mental health.

　　由于左撇子在人口中比例僅為10%，所以人們很容易忽略這樣一個事實，即自己正生活在一個左撇子的世界。除了能夠輕易地將自己同一般人區(qū)分開來之外，左撇子的習(xí)慣對個人的身體和心理健康還有著微妙的影響。

　　The brains and bodies of lefties may operate differently than those of right-handed people (and in mixed-handed people, who may have different dominant hands for different tasks). "Handedness seems to be determined very early on in fetal development, when a lot of other things about your future are being determined as well," says Ronald Yeo, PhD, professor of psychology at the University of Texas-Austin. Here's a look at some of the most common facts about being left-handed, and what it might really mean for your health.

　　習(xí)慣用右手的人，其大腦和身體的運轉(zhuǎn)方式可能和左撇子有所不同 (對雙 撇子來說，不同任務(wù)中他們會習(xí)慣用不同的手。)“人的許多特點在胎兒時期就已經(jīng)形成了，偏手性似乎也不例外，”德克薩斯州大學(xué)奧斯汀分校的心理學(xué)教授、博 士羅納德楊說。下面我們會探討有關(guān)左撇子的一些常識以及左撇子對健康的影響。

　　It's not just genetics

　　左撇子不一定都是遺傳因素導(dǎo)致的。

　　Scientists aren't exactly sure why some people are left-handed, but they know that genes are responsible about 25% of the time, says Yeo. Left-handedness does tend to run in families, he says, "but noticeably less than other inherited traits, like height or intelligence."

　　科學(xué)家們并不確定為什么有些人是左撇子，但是他們確信，左撇子的遺傳因素占到25%�！白笃沧拥拇_會在家族內(nèi)部遺傳，但與體重和智力等其他遺傳特性相比，其遺傳幾率卻要小很多�！绷_納德楊教授說。

　　It's linked to stress in pregnancy

　　左撇子與懷孕期間的壓力有關(guān)。

　　In one British study, the fetuses of super-stressed pregnant women were more likely to touch their faces more with their left hands than their right. This could be the first signs of a left-handed child, say the researchers. Other evidence supports that theory. In one 2008 Swedish study of moms and their 5-year-old children, women who were depressed or stressed during their pregnancies were more likely to have mixed- or left-handed kids. In other studies, babies with low birth weight, or born to older mothers, were more likely to be lefties as well.

　　英國一項研究顯示，壓力較大的孕婦生出的孩子 更傾向于用左手摸臉。這可能是左撇子在嬰幼兒時期的第一個征兆。而其他研究結(jié)果也證實了這一結(jié)論。2008年，瑞典的一項研究顯示，孕期較為壓抑或壓力較 大的婦女，她們的寶寶成為左撇子或雙撇子的可能性更大。其他研究還顯示，出生時體重較低的嬰兒或高齡產(chǎn)婦生產(chǎn)的嬰兒成為左撇子的幾率更大。

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