A recent study compared MRI scans of modern people's brains with casts of the inside of Neanderthal skulls. The results suggest that there is more variation in brain size among modern people than between Neanderthals and Pleistocene Homo sapiens. This could indicate that Neanderthal ancestors may have been more adaptable than previously thought. The study also suggests that despite having larger total cranial capacity (more room in their skulls), Neanderthans had smaller cerebellums than humans.