左撇子,右撇子,到底谁更聪明?

2017-06-18 MedSci 中国生物技术网

长期以来人们一直认为左撇子和天才之间存在关联。达芬奇是左撇子,马克·吐温、莫扎特、居里夫人、特斯拉、亚里士多德都是左撇子。在当代也是如此,美国前总统奥巴马、世界首富比尔盖茨、足坛巨星梅西,也都是左撇子。

长期以来人们一直认为左撇子和天才之间存在关联。达芬奇是左撇子,马克·吐温、莫扎特、居里夫人、特斯拉、亚里士多德都是左撇子。在当代也是如此,美国前总统奥巴马、世界首富比尔盖茨、足坛巨星梅西,也都是左撇子。

但是左撇子真的更可能是天才吗?让我们来看一下最新的证据,关于用手习惯和数学能力之间的关系。

据估计,人群中有10% 至13.5%的人不是惯用右手的,虽然这其中有一部分人可以“左右开弓”,但大部分的人还是只习惯用左手。

用手偏好是大脑功能的一种表现形式,因此它与认知功能有关。平均来看,左撇子的大脑右半球更发达,右半球负责空间推理等过程以及旋转物体心理表征的能力。心理表征是认知心理学的核心概念之一,指信息或知识在心理活动中的表现和记载的方式。

此外,左撇子的胼胝体(将大脑左右半球连接起来的神经细胞束)也更大。这表明,左撇子的左右半球连通性更好,因此在信息处理方面也更强。然而其中的原因尚不明确。一种理论认为,生活在一个为惯用右手的人设计的世界中迫使左撇子两手都要用,因此增强了脑半球之间的连通性。这就带来了这样一种可能性,即我们所有的人都可以通过双手并用训练来增强脑半球之间的连通性。

这也许是左撇子在某些专业和艺术方面更有优势的原因。比如,在音乐家、有创造性的艺术家和象棋选手中,左撇子的比例非常高。不需多言,高效的信息处理和卓越的空间能力是取得这些成就的关键。

用手习惯和数学能力

但是惯用左手和数学能力之间的关系是怎么样的呢?人们对用手习惯对数学能力的影响一直很感兴趣。30年前,一项开创性研究声称,惯用左手能够预测数学能力。该研究发现,左撇子在数学天才的学生中的比例比远高于普通人群。



胼胝体

然而,左撇子能够预测卓越的智力这个观点最近受到了挑战。一些专家认为左撇子与认知能力优势之间没有关系,甚至可能对认知功能产生不利影响,因此影响学术成就。

比如,一项研究发现,惯用左手的孩子在一系列发展测试中表现都不佳。此外,一篇最近的综述报告称,左撇子在智力残疾人群中的比例也比较高。另一项大型研究发现,在5至14岁的儿童中,左撇子的数学能力更差一些。

精心设计的实验

有趣的是,过去的这些研究在评价用手偏好和将受测者分类方面都各不相同,某些研究只是简单地问一下受测者习惯用哪只手。最重要的是,它们评价数学能力的方法也不同,有的使用简单的算术,有的使用了复杂的数学问题。这些实验设计方面的差异可能是导致观察结果不同的原因。

为了得到更可靠的结果,我们决定招募超过2300名学生(小学和高中)参与一系列实验。在这些实验中,数学任务的种类和难度都不相同。

为了确保可比较性,我们使用相同的问卷(Edinburgh用手习惯调查)来评估用手习惯。这个问卷询问受测者偏好用哪只手写字、画画、扔东西、刷东西等。它能够评估一个人偏好用左手和用右手的程度,它是对用手习惯程度的衡量,而不是绝对地惯用左手还是右手。这可以帮助我们建立更可靠的统计模型。

发表在《Frontiers》上的研究结果表明,当使用复杂数学问题时,左撇子的表现比其它人更好,比如将数学函数和数据集结合到一起。这种模式在男性青少年中尤为明显。相反,当数学任务不是那么难时,比如做简单算术,惯用哪只手并没有什么区别。我们还发现,极端的惯用右手者(他们做什么事情都喜欢用右手)相比于中等的惯用右手者和左撇子在所有的实验中表现都不佳。

平均来看,左撇子在解决数学问题方面更有优势,至少是在小学和高中阶段。此外,非常强的惯用右手习惯或许代表了数学能力的劣势。总而言之,这项发现表明,指示大脑左右半球连通性的用手习惯确实在某种程度上会影响认知能力。

也就是说,用手习惯只是大脑功能的一种间接表现。比如,只有三分之一大脑右半球更发达的人是左撇子。所以,很多惯用右手的人也有与左撇子类似的大脑结构。因此,在通过用手习惯来评价某人聪明或者愚笨时,我们必须要非常谨慎。

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    2017-06-29 1e10c84am36(暂无匿称)

    文章很好,拜读了

    0

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    2017-06-20 大爰

    学习并分享!!!

    0

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    2017-06-20 Boyinsh
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    2017-06-19 Lisa971

    左右利手的区别,影响着大脑的优势半球~

    0

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    2017-06-19 186****0580(小山羊)

    学习了谢谢了。

    0

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    2017-06-19 baihao215

    科学的态度,学习了

    0

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    2017-06-19 meiliwuxian

    有趣的实验

    0

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    2017-06-18 131****1460

    学习了,受益匪浅。

    0

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    2017-06-18 133****2089

    理性分析

    0

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