So, did they do brain-scans of "teens" and "adults" in societies where the distinction doesn't exist? Seems like the critical piece missing from the argument.
It's also possible that there was a smaller difference in the brain a few hundred years ago from factors like food availability. The current over-abundance of food is changing the the timing of puberty for example.
>The current over-abundance of food is changing the the timing of puberty for example.
Is it food availability, do you have a citation - I hypothesised that this was due to the wash of oestrogen-like chemicals and hormone disruptors in domestic use in the more developed nations.
Could be chemicals, could be nutrition or genetics, doesn't look like they pinned it down. But in the context of this discussion, culture shouldn't be the only culprit.
It's also possible that there was a smaller difference in the brain a few hundred years ago from factors like food availability. The current over-abundance of food is changing the the timing of puberty for example.