Scientific American(Genetics; support and disapproval)

First, its is important to remember that new structures (refering to genes) do not arise for anything. (68)

Unfortunately, exactly what it was that exapted the brain for modern cognitive purposes remains obscure. This is largely because while we know a lot about which brain componants are active during the performance of particular, we have no idea at all how the brain converts a mass of electrical and chemical signals into what we are individually familar with as consciousness and thought patterns(69)