They suggested that humans have traded off robustness for efficiency and hypothesized that the human brain may be more susceptible to psychiatric disorders. Recently, Pryluk, Kfir, Gelbard‐Sagiv, Fried, and Paz ( 2019) highlighted that human neurons have more efficient encoding than monkeys. It has been hypothesized that the human brain has traded‐off redundancy for efficiency to allocate connectivity for higher cognitive functioning such as intelligence (Marsman et al., 2017). Further studies are needed to explore its neuropathological implications. Our results support the hypothesis that the human brain has less redundancy in the commissural pathways than that of the rhesus macaque brain. The volume analysis showed a significant reduction in the orbitofrontal and occipital redundancy circuits of the human brain, whereas the temporal redundancy circuit had a substantial organizational difference between the human and rhesus macaque. The dissection results confirmed the existence of these redundancy circuits connecting the orbitofrontal lobe, amygdala, and visual cortex. We mapped their trajectories in human and rhesus macaque brains using individual and population‐averaged tractography. Each redundancy circuit has two distinctly separated routes connecting a common pair of cortical regions. Here, we report three redundancy circuits of the commissural pathways in primate brains, namely the orbitofrontal, temporal, and occipital redundancy circuits of the anterior commissure and corpus callosum. It has been hypothesized that the human brain has less redundancy than animals, but the structural evidence has not been identified to confirm this claim.
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