It is not uncommon to think that everyone is, essentially, the same. Certainly there don’t seem to be any significant genetic differences among different groups, particularly those genes involving the brain. But what if there are differences not among different racial/ethnic/cultural groups but, rather, within the human species as a whole?
About 84% of the genes are expressed in the brain. Given that humans have 20,000 genes, that means about 16,800 genes are expressed in the brain.
We should not be surprised, then, if we were to find more than a bit of variation among human brains.
We should expect to see variation in degrees of creativity vs. copying, on liberalism vs. conservatism, on selfish behavior vs. altruism, introversion vs. extroversion, leadership vs. following, variations in thinking styles, degrees of mental energy, I.Q. and flexibility of I.Q., and of course any of a variety of learning…
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