Why is the human brain size decreasing?

Indeed, skeletal evidence from every inhabited continent suggests that our brains have become smaller in the past 10,000 to 20,000 years. How can we account for this seemingly scary statistic? Some of the shrinkage is very likely related to the decline in humans' average body size during the past 10,000 years. read more

No one knows why human brain size is decreasing, but there are some very obvious benefits to having a smaller brain. One of the most dangerous stages of normal human life is childbirth, which has a mortality rate somewhere between 10/100,000 and 1500/100,000 births. read more

Some of the shrinkage is very likely related to the decline in humans' average body size during the past 10,000 years. Brain size is scaled to body size because a larger body requires a larger nervous system to service it. read more

For more than 7 million years the hominid brain has grown increasingly bigger, almost tripling in size. But for the last 10,000 years, the human brain has been shrinking at an alarming rate and no one really knows why. read more