Hm, this sounds like a pretty solid evidence for the food-competition (scarcity) hypothesis. However the evidences for the mating-competition hypothesis are also fairly strong. Not sure if non-primates matter, but animals like deer or reindeer are walking knee deep in food ( grass) and the mating competition, antler fights, is pretty strong. What I find particularly convincing is humans having abnormally large maternal investments (huge baby head → dangerous birth, slow infant development → lots of mothering investment) which would suggest one hell of a mating competition. But it could also be used as an evidence of fathering investment and monogamy. I don’t really know how to construct at least a thought experiment to split the two without having an influence from culture. After all, if big heads are part of my hypothesis, i.e. intelligence is, intelligence pretty much means something akin to a culture must be there. Culture is probably way older than the archeological evidence for it—just the old versions lacking in artifacts. While lack of evidence is an evidence for lack, probably in case of archeology it is not true—it is a highly inefficient thing. For example, from much more recent history, Gaels were considered to be culturally inferior to Romans because they did not build roads and bridges. Turned out they did, but they made them out of wood, not stone, and that is far harder to find and evidence through archeology.
Hm, this sounds like a pretty solid evidence for the food-competition (scarcity) hypothesis. However the evidences for the mating-competition hypothesis are also fairly strong. Not sure if non-primates matter, but animals like deer or reindeer are walking knee deep in food ( grass) and the mating competition, antler fights, is pretty strong. What I find particularly convincing is humans having abnormally large maternal investments (huge baby head → dangerous birth, slow infant development → lots of mothering investment) which would suggest one hell of a mating competition. But it could also be used as an evidence of fathering investment and monogamy. I don’t really know how to construct at least a thought experiment to split the two without having an influence from culture. After all, if big heads are part of my hypothesis, i.e. intelligence is, intelligence pretty much means something akin to a culture must be there. Culture is probably way older than the archeological evidence for it—just the old versions lacking in artifacts. While lack of evidence is an evidence for lack, probably in case of archeology it is not true—it is a highly inefficient thing. For example, from much more recent history, Gaels were considered to be culturally inferior to Romans because they did not build roads and bridges. Turned out they did, but they made them out of wood, not stone, and that is far harder to find and evidence through archeology.