I did not suggest any drastic change but said we mustobserve a few beneficial mutations related to the brain during the time of civilization. Additionally, from the dawn of civilization there was more natural selection pressures from humans to have even bigger brains and thus there should be some small indication of change from that period.
So in effect, we just need to find a small increase in brain size from the dawn of civilization to present - that is all. Has this been obvserved or not?
There is no must for beneficial mutations to have occured during the time of civilization. And if there were any, they would not have to be increases in brain size.
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