Morphological comparison of superficial white matter bundles between the human and chimpanzee brain

The role of the superficial brain connections remains unclear. They appear to be important in the structural organization of the connectivity between the different brain gyri and are usually described as 'U-fibers' referring to their shape. Using an isomap algorithm, we explored in finer detail the superficial connectivity of the chimpanzee and human brains, still poorly known. This method allowed us to better capture the variability of the different shapes of the bundles that we observed and to overcome many bias due to subjective preconceptions.