I read a useful way of dividing our consciousness into three different levels. The idea is from the book "Visions" by Michio Kaku . First level: ------------- The lowest level of consciousness is the ability of an organism to monitor its body and its environment. By this definition, even a thermostat has some consciousness since it monitors the surrounding temperature. Examples of this level: a) Bacteria going away from higher temperature area or going towards food. b) Humans taking away the hands when accidentally kept on a hot surface. c) Babies moving hands and doing other things when born. These are mostly hard-wired functions. Second level: ---------------- The second level is the ability to carry out well-definted goals, like survival and reproduction. Higher up on this second level lies the entire animal kingdom. Once the primary goals ( e.g., finding food and mates) are preprogrammed into the animal brain, they determine the complex plans to carry...