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Wait, what? What are even the alternatives? The only alternatives are environmental pressure - food, predators etc. But such an environmental pressure affects a lot of species at the same time and for this reason, most traits in the animal kingdom have the expected normal distribution. Such as the ability to swim amongst mammals - many can swim a little, some better, and a few really well. Yet the distribution of intelligence in species does not follow normal distribution. Humans are far, far ahead from the species in the second places (apes, dogs, dolphins). If it was environmental pressure, adult chimpanzees were basically like retarded humans or humans who are stuck at the mental capabilities of a 10 year old. Bonobos would be flipping burgers at McD. (OK some people do claim that certain dogs have the IQ of a 5 year old human but it is really a stretch. Their communication ability and suchlike does not even compare.)
Being so far ahead can mean only one thing - the selective pressure MUST have came from withing the hominid species, not from the environment.
But what could hominids compete for? Not food. Food is also an environmental variable and if we don't see e.g. gorillas compete a lot of for food, we should assume there was enough around.
This gives really only one option left.
Factor in that runaway processes MUST have, I will risk a "per definition" here even though it is not math, a feedback element. Whatever X-factor (lol) pressed humans to get more intelligent, must have been made worse by humans getting more intelligent, so it exerted even more and more pressure or how else could it be such a runaway process.
This is useful, because it suggests we should just look at what was made worse by the evolution of intelligence and we found the feedback factor. And the answer is obvious: reproduction. Childbirth, the physical process of getting the head out, and the babycare.
In my mind it is a fairly strong set of evidence and it not only predicts everything we want it to predict here, it also reliably fails to predict everything it shouldn't and that is what a good theory should do.
For example, if food scarcity was a selective factor, we would have iron stomachs, able to eat everything. In reality, we have shit for stomach, we need to cook our food, we cannot digest most leaves nor grass - the most available resource! - we get ill easily and so on. Sure, human diets have a wide variance, but it seems we are really picky eaters, going for the special stuff, not the easy available stuff: leaves, grass, carcass. What does that suggest? It suggests no food scarcity.
Or say predators. Most animals try to protect themselves from predators with claws and fangs. Again, we have crap in that department. If there was any serious pressure there, we'd kept these around.
So what kind of environmental pressure is left, really?
I am also surprised that it is you who say it, because I had the impression you give some credibility to the set of views that are sometimes called red pill or manosphere. They are 100% based on sexual selection shaping human nature, without that they haven't any chance of getting anything right.
This is what I mean by lazy evo-psych. You dismiss the alternatives using hand waving logic and assert that it must be sexual selection even though one could dismiss sexual selection just as easily by hand waving. Let's go through you comment piece by piece.
And different species respond to [edit:similar] environmental pressures in different... (read more)