Possibly. However, I wonder if we were really all that much smarter? Neanderthal man in fact had a larger head then homo sap sap. They in fact were surviving quite nicely for thousands of years in Europe till we came along. Now what I do know is that the human head at birth is near the maximum for allowing the female gender to be bipedal, and birth is a risky procedure for humans. It would be very enlightening if we found a Neanderthal babies skeleton, see what size it was closer to birth. Maybe we weren't smarter then them, maybe we just out reproduced them, by having smaller skulled children.

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