If read this correctly, it does hold in very narrow sense, when compared within hominid evolutionary path only. In general size of brain is proportional to bod

If read this correctly, it does hold in very narrow sense, when compared within hominid evolutionary path only. In general size of brain is proportional to body mass, more sensors bigger brain, has nothing to do with intelligent effective behavior, to large extent, arguably. To best of my knowledge there is no known method that would estimate minimum amount of neurons even for simple problems, let alone complex one, however there is convergence of some form cerebral cortex between species, but octopi break this model to large extent (might we wrong here). Things get even more complicated when you account for space between individual neurons.