The functional overlap of language and arithmetic is debatable. Although some studies have reported independent representations of arithmetic and language in the brain, other studies have reported shared activity of the two cognitive domains in the inferior frontal gyrus. Although most previous studies have evaluated right-handed individuals, variability of hemispheric dominance in non-right-handed individuals should provide important information on the functional collateralization of these two cognitive domains. The present study evaluated the cortical lateralization patterns of the two cognitive domains using functional magnetic resonance imaging in 30 non-right-handed participants who performed language and arithmetic tasks. We found that language and arithmetic tasks demonstrated shared activity in the bilateral inferior frontal gyrus (IFG). Furthermore, the lateralization patterns of language and arithmetic tasks were correlated with each other. Most participants with language dominance in the left hemisphere also exhibited dominance of arithmetic tasks in the left hemisphere; similarly, most participants with language dominance in the right hemisphere exhibited dominance of arithmetic tasks in the right hemisphere. Among all the brain regions, the precentral gyrus, which is located slightly posterior to the IFG, exhibited the highest correlation coefficient between laterality indices of language and arithmetic tasks. These results suggest a shared functional property between language and arithmetic in the brain.

中文翻译：

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非右撇子者的语言和算术引起的皮质抵押。

语言和算术的功能重叠值得商de。尽管一些研究报告了大脑中算术和语言的独立表示，但其他研究报告了额下回中两个认知域的共享活动。尽管大多数先前的研究已经评估了惯用右手的个体，但非惯用右手的个体中半球优势的变异性应提供有关这两个认知域功能抵押的重要信息。本研究使用功能性磁共振成像技术对30位执行语言和算术任务的非惯用右手参与者评估了两个认知域的皮层偏侧化模式。我们发现语言和算术任务证明了在双侧下额回（IFG）中的共享活动。此外，语言和算术任务的偏侧化模式相互关联。大多数在左半球具有语言优势​​的参与者在左半球也表现出占主导地位的算术任务。同样，大多数在右半球具有语言优势​​的参与者在右半球也表现出占主导地位的算术任务。在所有大脑区域中，位于IFG稍后方的中央前回在语言的侧向指数和算术任务之间表现出最高的相关系数。这些结果表明，语言和算术在大脑中具有共同的功能特性。大多数在左半球具有语言优势​​的参与者在左半球也表现出占主导地位的算术任务。同样，大多数在右半球具有语言优势​​的参与者在右半球也表现出占主导地位的算术任务。在所有大脑区域中，位于IFG稍后方的中央前回在语言的侧向指数和算术任务之间表现出最高的相关系数。这些结果表明，语言和算术在大脑中具有共同的功能特性。大多数在左半球具有语言优势​​的参与者在左半球也表现出占主导地位的算术任务。同样，大多数在右半球具有语言优势​​的参与者在右半球也表现出占主导地位的算术任务。在所有大脑区域中，位于IFG稍后方的中央前回在语言的侧向指数和算术任务之间表现出最高的相关系数。这些结果表明，语言和算术在大脑中具有共同的功能特性。它位于IFG的稍后方，在语言和算术任务的横向指数之间表现出最高的相关系数。这些结果表明，语言和算术在大脑中具有共同的功能特性。它位于IFG的稍后方，在语言和算术任务的横向指数之间表现出最高的相关系数。这些结果表明，语言和算术在大脑中具有共同的功能特性。