Interesting comment of a researcher regards animals with larger brain and cortical neurons as they compare to the human brain, which may explain why humans retain their vastly superior intelligence despite differences in brain size, it appears cortical neuron count can still define the difference:
Despite the enormous number of neurons in the elephant cerebellum, its cerebral cortex, which is twice the size of ours, has only one third of the neurons in an average human cerebral cortex. Taken together, these results suggest that the limiting factor to cognitive abilities is not the number of neurons in the whole brain, but in the cerebral cortex (to which I would add, “provided that the cerebellum has enough neurons to shape activity in the cerebral cortex”).We don’t have data on whales yet, but that research is underway in our lab – along with research on carnivores, who we predict to have more neurons than the large artiodactyls that they prey upon.-https://intelligence.org/2014/04/22/suzana-herculano-houzel/
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