Cerebral asymmetries: complementary and independent processes.
Cerebral asymmetries: complementary and independent processes.
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DOI：
10.1371/journal.pone.0009682
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发表时间：
2010-03-12
期刊：
影响因子：
3.7
通讯作者：
Corballis MC
中科院分区：
文献类型：
--
作者：
Badzakova-Trajkov G;Häberling IS;Roberts RP;Corballis MC
大多数人都是右撇子，说话时左脑占优势，这在历史上导致了左半球占优势的普遍概念，最近的遗传模型提出了一个单一的偏侧基因。这个假设的基因可以解释为什么那些左脑主导语言的人更容易成为右撇子。目前尚不清楚这种优势与右脑在一些非语言功能（如空间或情绪处理）中的优势有何关系。本研究利用功能磁共振成像技术对155名受试者进行了脑额叶语音生成、颞叶面部处理和顶叶空间处理诱导的非对称激活。左额叶、右颞叶和右顶叶的优势都是相互关联的，这表明右脑的偏见可能至少在一定程度上与左半球的语言优势互补。然而，利手性和空间处理的顶叶不对称是不相关的，这意味着独立的偏侧过程，一个产生与利手性最密切相关的左偏，另一个产生与空间注意最密切相关的右偏。
Most people are right-handed and left-cerebrally dominant for speech, leading historically to the general notion of left-hemispheric dominance, and more recently to genetic models proposing a single lateralizing gene. This hypothetical gene can account for higher incidence of right-handers in those with left cerebral dominance for speech. It remains unclear how this dominance relates to the right-cerebral dominance for some nonverbal functions such as spatial or emotional processing. Here we use functional magnetic resonance imaging with a sample of 155 subjects to measure asymmetrical activation induced by speech production in the frontal lobes, by face processing in the temporal lobes, and by spatial processing in the parietal lobes. Left-frontal, right-temporal, and right-parietal dominance were all intercorrelated, suggesting that right-cerebral biases may be at least in part complementary to the left-hemispheric dominance for language. However, handedness and parietal asymmetry for spatial processing were uncorrelated, implying independent lateralizing processes, one producing a leftward bias most closely associated with handedness, and the other a rightward bias most closely associated with spatial attention.
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