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Broken Symmetry

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A Brain for Speech

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Abstract

Early neurologists soon noticed that in most people, the language capacity appears to be localized in the left hemisphere of the brain. This has provided ground for many speculations about the functions of the left and the right sides of the brain. However, evidence has shown that language processing is largely bilateral but each hemisphere specializes in different functions. Language lateralization has been associated to handedness, and some authors have proposed that handedness drove the lateralization of language, which initially emerged as a hand-signing system. I review these ideas critically, proposing that in evolution, asymmetries in brain function may arise from different functional requirements, although there may be similar underlying genetic and developmental mechanisms.

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  1. Department of Psychiatry, Medical School, and Interdisciplinary Center for Neuroscience, Pontificia Universidad Católica de Chile, Santiago, Chile

    Francisco Aboitiz

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Aboitiz, F. (2017). Broken Symmetry. In: A Brain for Speech. Palgrave Macmillan, London. https://doi.org/10.1057/978-1-137-54060-7_4

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