There are two fascinating new papers about language evolution in Nature Neuroscience (institutional access required). The first, by Rilling et al is a comparative MRI scan of human and primates, looking at the circuit level activation of the arcuate fasciculus, the neural pathway that links two major language areas of the brain, Wernicke’s Area and Broca’s area. It is this pathway that is lesioned in Aphasiacs. They found a significant difference in the levels of connectivity and the location of the terminations of the pathway across the species. In two other control pathways where no difference was predicted, they found reasonable uniformity across the species.
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The next day brought a couple of plenary speakers who both spoke on fascinating topics but somehow managed to make them dull as hell or inpenetratable.
Rudolph Botha began by looking at exaptation and argued that it is a mechanism that is too frequently employed in accounts of language evolution. He painstakingly went through a series of examples in the literature where exaptation is heavily invoked and tried to show that it did not meet the standards for exaptation that most biologists would use. It was persuasive, and on an interesting topic, but somehow Botha contrived to make it duller than a Calvinist sermon. Come on Rudi, this subject is naturally cool, it shouldn’t have the life sucked out of it like this.