Professor Robin Dunbar, also from Oxford University and a co-author of the
study, said that people whose ancestors lived within the Arctic Circle* have eyeballs
20% bigger than people whose ancestors lived near the equator. They have an
associated increase in the size of the visual part of the brain, which previous studies
20 have shown matches with the size of the eyeball. Brain volume increases with latitude:
shown match
people living at high latitudes north and south of the equator have bigger brains than
people living near the equator.
The results, published in the journal Biology Letters, showed that the biggest brains.