Jejudo, South Korea
"Furthermore, from an evolutionary point of view, it is unlikely that larger brains would have developed if there was not an advantage."
When have you ever seen something perfect? I dont think growling apes needed what we have today, but after years and years, trying not to become extinct and using tools to assure we wont.
I get the distinct feeling that you feel there's some kind of far flung purpose to evolution. The only way I can imagine what you present is something like saltationism (massive shifts in the genome creating new species virtually over night), but that's not evolution. As has been pointed out by Aenimal and Crawdad, evolution doesn't work by magic.
You ask, why wouldn't evolution give us the full potential of our brains?
But the question misses the point of why we have a larger brain at all. Given the amount of energy that goes into actually using this gray stuff in between our ears, it doesn't make sense, from an evolutionary perspective, to see it as only partially used.
Two quick questions:
1. When you say potential, the potential to do what?
2. Isn't it your turn to offer a website, a scientific one, that backs up your claims?