Agriculture seems plausibly relevant here, but I’m confused by your comment about maternal mortality. The fact that it has always been a selective pressure issue means that it isn’t plausible that it would be a cause for a decline in brain size unless maternal mortality somehow became worse.
Agriculture seems plausibly relevant here, but I’m confused by your comment about maternal mortality. The fact that it has always been a selective pressure issue means that it isn’t plausible that it would be a cause for a decline in brain size unless maternal mortality somehow became worse.