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冬季是多左撇子男人的“暖春”
2014-07-04 15:21:34 来源:左撇子在中国 作者:左撇子在中国
内容提要:“左撇子”男人多出生在冬天,你是吗?

 

                                         冬季是多左撇子男人的“暖春”

一提到左撇子,自然很多疑问冒出来:为什么人会有左撇子和右撇子之分?为什么左撇子只有10%比例呢?但是你知道-哪个季节出生的人多是左撇子?

在涉及和手相关的运动(棒球、拳击、高尔夫、篮球等),左撇子比例相对较高。比如在棒球,左撇子占了25% 这些看似简单的问题,至今都无法解释的明白。

维也纳大学的科学家对左撇子的奥秘进行了不断地探索,他们搜集了13000名奥地利人和德国人的出生日期、年纪及性别,通过统计分析,发现11-1月出生的人多是左撇子。比例为10.5,而2-10月份左撇子比例仅为8.2

对这个现象,研究者据推测11-1月属于相对黑暗时期,并不是导致左撇子集中出生的阶段。研究负责人认为5-6月为光明时期,这才是最终的原因。

为了解释男子中特有的现象,他们想到了性激素——睾酮。早在1980年,美国的两位神经学家就提出一个理论:在胚胎发育过程中,睾酮可延缓左脑成熟。睾酮合成与日照长度关系密切,夏季(5-7月)白天长,子宫内睾酮水平高,左脑发育时间长,易形成右撇子,反之,冬季(11-1月)易形成左撇子。

研究最后发现,这个结论比较适合男人,也就是冬天出生的左撇子多是男人。

我是1月份出生的左撇子男,这个发现在我个人身上得到“临时的”验证,左撇子们,你们是哪个季节出生的呢?

原文期刊【PDF】下载: Latent variable analysis indicates that seasonal anisotropy accounts for the higher prevalence ofleft-handedness in men

 原文新闻:More left-handed men are born during the winter

Researchers have found a remarkably clear correlation between winter-births and left handedness, where up to 9 percent of all children born in winter months are left handed, compared to significantly lower rates for the rest of the year. Analysis of this correlation supports a 35-year-old theory, according to a recent study.

Left handedness was once commonly associated with evil and even death, where the angel Gabriel - one of six angels of death - was called God's left hand, while black magic was commonly referred to as "the left hand path" during early colonial times.

In some small way, it may have been that these superstitions from an age-gone-by were taking inspiration in-part from the fact that left handed children were most commonly born during the winter season - a time when the days are shortest and life was hardest for growing hungry families.

According to a study published in the journal Cortex in a survey of nearly 13000 adults from Austria and Germany, a great majority of left handed people, especially among men, were born during November, December, and January, with only 82 percent being born between February and October, and 10.5 percent being born between November and January.

According to lead author Ulrich Tran, this phenomenon is best explained by the theory that light exposure can lead to varied testosterone exposure in the womb.

"Presumably, the relative darkness during the period November to January is not directly connected to this birth seasonality of handedness. We assume that the relative brightness during the period May to July, half a year before, is its distal cause", he explained in a statement.

According to Tran, US neurologists Norman Geschwind and Albert Galaburda first argued that testosterone levels may influence handedness in the 1980s. They said that elevated levels may slightly delay the development of the left hemisphere of the brain, leading to a dominance of the right hemisphere - which is connected to the left hand.

Trans and his colleagues add to this theory, arguing that if a child's mother is exposed to more daylight while pregnant, her testosterone levels may rise high enough to affect the baby's own levels, potentially leading to a change in handedness.

The authors admit that other factors may play a part too, resulting in an estimated 10 percent of the world's populations being left-handed. A 2011 study published in Obstetrics and Gynecology revealed that there is also "a statistically significant - albeit weak - association between ultrasound screening during pregnancy and being non-right handed later in life."

Although, much like this latest study, the authors suggest that more research will be needed to find a clear causal relationship.

 

 

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