Human Brains Evolved Gradually, Not in Sudden Leaps

From Neuroscience News

A new study reveals that modern humans, Neanderthals, and other relatives evolved larger brains through gradual changes within each species, overturning the idea of sudden leaps in brain size. Researchers used the largest-ever fossil dataset spanning 7 million years and advanced statistical methods to reconstruct brain size evolution.

They found no consistent correlation between brain and body size within species, highlighting the unique evolutionary pressures shaping brain growth. This research challenges long-standing views and underscores the steady, incremental nature of human brain evolution.