A UNIQUE twist in the development of the human brain may explain how we
evolved the capacity for complex abilities such as language and abstract
thought.
At some point in our evolution the brain areas that mediate these talents
began to expand. How did they do that? By sending an army of extra neurons along
a route uncharted in other mammals, say Kresimir Letinic and Pasko Rakic of Yale
University Medical School in Connecticut. This process allowed key brain regions
that normally develop separately to bulk up in synchrony.
This study is the first to show a difference in brain…
