" Each sucker on an octopus’s arm may have 10,000 neurons to handle taste and touch. Even an arm that has been surgically removed can perform various basic motions, like reaching and grasping. How does an octopus’s brain relate to its arms? Early work, looking at both behavior and anatomy, gave the impression that the arms enjoyed considerable independence. The channel of nerves that leads from each arm back to the central brain seemed pretty slim. Some behavioral studies gave the impression that octopuses did not even track where their own arms might be. As Roger Hanlon and John Messenger put it in their book Cephalopod Behaviour, the arms seemed “curiously divorced” from the brain, at least in the control of basic motions. "

― Peter Godfrey-Smith , Other Minds: The Octopus, the Sea, and the Deep Origins of Consciousness