If your brain and body spanned the size of the Earth, the signals into and within the brain would as a matter of physics take much longer than with a human. It

If your brain and body spanned the size of the Earth, the signals into and within the brain would as a matter of physics take much longer than with a human. It seems reasonable to suppose this is also true when you compare a tiny fly with a comparatively massive human. That said, I haven't seen specific, explicit evidence to prove this seemingly logical theory.