Aharon wrote:
Didn't know I had a bigger brain. I just assumed I had a thicker skull.
Aharon, you've got me chuckling now. You may have a thicker skull, but I doubt it's that much thicker!
Seriously, the ratio I've described isn't always true. There are medical conditions that cause one to be hypercephalic without being particularly intelligent. But as a general rule, having a head disproportionately large compared to the body means higher intelligence.
The reason is we actually have three brains: The part of our brain that regulates our bodies, the part that creates our emotions, and the top brain that permits higher order thinking. The reason animals like dogs and simians tend to have sharply sloping foreheads is they don't have a well developed top brain that allows for abstract thought; only humans have this.