>>12826776brain size and amount of neurons can be indicators of intelligence but not the best, what matters is what those process are dedicated to. for example, the killer whales has about twice as many neurons then a human and a far larger brain, but most of that extra brain space in killer whales are dedicated to different processes then intelligence. primitive humans, like the Neanderthals, brains where bigger then ares, however its debated weather or not this means there more intelligent, in the case of Neanderthals, its been suggested that this extra space was dedicated to better visual processing (since a large portion of genes the improve eye sight come from neanderthals) and less to intelligence and the social processes of there brains (based on how there society was organized).
i know that the genes associated with intelligence where increasing in Eurasian populations, but they have decreased in number in the last hundred years or so.
