From Colin Barras at New Scientist:
It’s not the size of your brain, it’s how you organise it. The most recently discovered species of early human had a skull only slightly larger than a chimpanzee’s, but its brain looked surprisingly like our own – particularly in an area of the frontal lobe with links to language.
This could back suggestions that these mysterious early humans showed advanced behaviours, such as teamwork and burial, even though we still don’t know exactly when they lived. More.
Throughout the animal kingdom, the relationship between a brain and intelligence is much more complex than is sometimes supposed.
See also: Why is the recent dating of Homo Naledi to 250 kya a problem? We should avoid dogmatism, especially about stuff like brain size and smartness.
Does intelligence depend on a specific type of brain?
Neuroscience tried wholly embracing naturalism, but then the brain got away
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