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The brains of humans and old-world monkeys show a great deal of anatomical similarity. The auditory cortical system, for instance, is organized into a ventral and a dorsal pathway in both species. A fundamental question with regard to the evolution of speech and language (as well as music) is whether human and monkey brains show principal differences in their organization (e.g., new pathways appearing as a result of a single mutation), or whether species differences are of a more subtle,doi:10.3389/fnevo.2012.00007 pmid:22615693 pmcid:PMC3351753 fatcat:ntc2clfl7jegblteq466pzfze4