Primate auditory prototype in the evolution of the arcuate fasciculus

The human arcuate fasciculus pathway is crucial for language, interconnecting posterior temporal and inferior frontal areas. Whether a monkey homolog exists was controversial and the nature of human-specific specialization unclear. Using monkey, ape and human auditory functional fields and diffusion MRI, we identified homologous pathways originating from auditory cortex. This discovery establishes a primate auditory prototype for the arcuate fasciculus, reveals an earlier phylogenetic origin and illuminates its remarkable transformation.