I would tend to agree, but Inuit people (for eg.) have lived in even harsher environments than early Europeans did for thousands of years, but don't seem to have developed similar cultural traits.
Also (correct me if I am wrong) there are indications that early Europeans tended to have female deities alongside or instead of male deities (as did indigenous peoples around the world). Of course this might have been a carryover from a period of living in less harsh environments, before patriarchal deities completely replaced them. But it seems that many Europeans, especially wombman, kept some remnants of these earlier traditions intact for some time, these were the people who were burned as "witches."
Karibkween, I'm not aware of the studies showing differences in brain function between Africans and Europeans, do you have any links/references for this?