4 ms·

Another factor is that body mass is highly correlated to brain mass: https://www.cfa.harvard.edu/~ejchaisson/cosmic_evolution/docs/images/imgs_sml_ver3/7_13.gi

• gweinberg 11y ago
  Except when it isn't. Dinosaurs had much smaller brains than humans, not just relative to body mass but absolutely. A big body does not necessarily require a proportionally large brain.
  • thaw13579 10y ago
    It's usually found when looking within mammals and is only a first approximation at best, but it seems to be a useful one at least: https://en.wikipedia.org/wiki/Encephalization_quotient https://en.wikipedia.org/wiki/Encephalization_quotient