According to this Economist Expresso article, human brains started to shrink about 3000 years ago possibly due to living in social groups where the collective intelligence reduced the need for individual brain powers/activities (known to be energy consuming).
Which implies that loners today might be in relative evolutionary disadvantage compared to team-workers today and loners 3000 years before.
Hive mind shrank human brains https://t.co/J9h5vBrgoj
— Li-Yi Wei (@liyiwei) October 23, 2021
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