"[i]f you look closely at our nervous system, you’ll see that there are neuronal clusters distributed throughout the body. Human computation is better understood as distributed than centralized."

It's kind of like having a computer at the home, but tens of thousands of computers at a data center. Things like reflexes can happen quickly because you don't have to go all the way to the brain, but your arm isn't going to be adding 2+2 by itself.