Overview
- An Indiana University–led study published Monday in PNAS compared MRI data from about 200 Americans of European ancestry and 200 ethnic Han Chinese, finding that most estimated Neanderthal–human brain differences fall within normal modern human variation.
- The team assessed 13 brain regions and reported larger differences between the two living populations in nine regions than those estimated between Neanderthals and early Homo sapiens.
- The authors conclude a broad intelligence gap is unlikely to explain Neanderthal replacement, noting a small difference tied to attention and inhibition that they say is too minor to account for a rapid disappearance.
- The study favors demographic forces such as genetic swamping, where interbreeding dilutes a smaller group’s genes into a larger one, a process consistent with traces of Neanderthal DNA in many people today.
- Independent modeling led by Ariane Burke indicates climate variability, fragmented habitats, and weaker social-network connectivity left Neanderthal groups more vulnerable, while archaeological finds of art, adhesives, tailored clothing, and controlled fire further weaken the idea of a decisive cognitive shortfall.