I stand corrected, my original statement was based on knowledge collected from a biology class 15 years ago. I just did some googling and learned about how autonomous the ganglion are in lobsters. What surprises me is that there is a lot of literature and diagrams on the net that still refer to the central ganglion as a brain. The anatomists, biologists and zoologists need to get together and get the definitions straight on what a brain really is.
I hesitate to add this, but I guess I'm in a safe place... We once removed the distal ganglion (the 'brain-' like section) from an anesthetized lobster, cauterized the surgical site, sealed it with epoxy, and threw the lobster back in a tank. Other than the fact that the lobster walked very carefully, it lived and ate for a little less than a week... when the boss ate it.