Dr Alva Noe is interviewed by Deepak Chopra and explains how consciousness, rather than simply being a product of the brain, is actually distributed throughout the entire body.
Deepak Chopra: You Are Not Your Brain: Interview With Alva Noe, Ph.D.
"In fact if you ask a good neurobiologist today, what's the difference between the immune system and the nervous system? Many neurobiologists who keep up with their literature will tell you that there isn't a clear difference. Your immune cells are like a circulating nervous system. Your nervous system in fact is a circulating nervous system. It thinks. It's conscious. But as we start to look at the rest of the body we start to find the same phenomena. So when scientists begin to look at stomach cells for example, stomach cells also make the same peptides the brain makes. In fact if you say "I have a gut feeling about such and such," you're not only speaking metaphorically but you might be speaking literally because your gut makes the same chemicals that your brain makes when it's thinking."