This is correct. Urban living causes a form of brain damage. Cities have always been dysgenic.
https://www.nature.com/articles/nature10190
Current city living was associated with increased amygdala activity, whereas urban upbringing affected the perigenual anterior cingulate cortex, a key region for regulation of amygdala activity, negative affect9 and stress10. These findings were regionally and behaviourally specific, as no other brain structures were affected and no urbanicity effect was seen during control experiments invoking cognitive processing without stress.
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