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Humanity and the left hemisphere: The story of half a brain. | LitMetric

Humanity and the left hemisphere: The story of half a brain.

Laterality

School of Psychology, University of Auckland, Auckland, New Zealand.

Published: April 2021

Until fairly late in the nineteenth century, it was held that the brain was bilaterally symmetrical. With the discovery of left-brain dominance for language, the so-called "laws of symmetry" were revoked, and asymmetry was then seen as critical to the human condition, with the left hemisphere, in particular, assuming superordinate properties. I trace this idea from the early discoveries of the late nineteenth century through the split-brain studies of the 1960s, and beyond. Although the idea has persisted, the evidence has revealed widespread cerebral asymmetries in nonhuman animals, and even language and its asymmetries are increasingly understood to have evolved gradually, rather than in a single speciation event. The left hemisphere nevertheless seemed to take over a role previously taken by other structures, such as the pineal gland and the hippocampus minor, in a determined effort to place humans on a pedestal above all other species.

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Source
http://dx.doi.org/10.1080/1357650X.2020.1782929DOI Listing

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