"Similar to insects, the nervous system of a lobster is very simple and neither insects nor lobsters have real brains. Lobsters have a series of 15 nervous ganglia that span the length of the lobster, on the ventral side or belly side, with nerves projecting from each of these ganglia. The first ganglion is the closest thing to a brain. In general, for an organism to perceive pain it must have a complex nervous system. Many scientists that are studying the nervous system of lobsters tell us that they do not process pain. Lobsters don’t have a cerebral cortex, which is where pain is processed in humans or dogs and cats. If they do feel pain, it is most definitely in a different way than humans do. A new study out of Norway concluded that most invertebrates - including lobsters, crabs, worms, snails, slugs and clams - probably don't have the capacity to feel pain..." (Source: Atlantic School of Veterinary Medicine)