Anthropologist John Hawks (quoted in the Discover article) in this video (at the 9:23 mark) shows data on the shrinking human brain over 16000 years. On his display it looks to me like the scatter extrema for today are over twice as large as the decline in the linear regression line. The number of data points from 16000 years ago is not large.
Anthropologist John Hawks (quoted in the Discover article) in this video (at the 9:23 mark) shows data on the shrinking human brain over 16000 years. On his display it looks to me like the scatter extrema for today are over twice as large as the decline in the linear regression line. The number of data points from 16000 years ago is not large.