Other evidence I would add to the theory of the brain being a ULM is the existence of the g-factor, and the fact the general factor is one that explains the most variation in these cognitive tests. In addition—if you model human cognitive abilities as universal and specific, evolutionarily speaking it would make sense for the universal aspect to be under stronger selection than the specific domain. One exception to this could be language learning, which is important just for the sake of being able to communicate.
Other evidence I would add to the theory of the brain being a ULM is the existence of the g-factor, and the fact the general factor is one that explains the most variation in these cognitive tests. In addition—if you model human cognitive abilities as universal and specific, evolutionarily speaking it would make sense for the universal aspect to be under stronger selection than the specific domain. One exception to this could be language learning, which is important just for the sake of being able to communicate.