The Evolution of Octopus

Human consciousness might be spread across the equivalent of nine brains which is one central brain and then a brain in each arm each of the eight arms. Octopuses have about 500 million neurons but it's spread across their body there are various studies of how this works. One found that octopuses can do what they call arm-up decision-making where the arm senses something before the central brain or initiates a motor response without consulting with the central brain.