Humans take a lot of pride in their brains. We like to think we are an intelligent species, and even though size isn't everything, our noggins are some of the largest nature has to offer.
That's really recent compared to other theories. Some scientists have said human brains started shrinking sometime after the last ice age, whichDeSilva's paper positioned the loss in brain size right around the time that complex human societies arose.
"We re-examined the dataset from DeSilva et al. and found that human brain size has not changed in 30,000 years, and probably not in 300,000 years,""In fact, based on this dataset, we can identify no reduction in brain size in modern humans over any time period since the origins of our species." Of all 987 skulls analyzed by DeSilva and colleagues, only 23 actually come from the timeframe that is critical to their brain shrinkage hypothesis. The dataset in the new study is much narrower to avoid skewing the results. It focuses on modern humans from the last 300,000 years only.
To compensate for this unbalanced comparison, researchers honed in on human cranium fossils from the last 30,000 years specifically, which created a more normal distribution.
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