The Gourmet magazine article is an essay by David Foster Wallace and well worth the read just because it's interesting. It's long, but definitely not preachy. The author is conflicted about his feelings when eating lobster. The portion of the essay relevant to the brain vs distributed nervous system is copied blow, but that question only addresses half of the issues ethicists consider relevant. The essay is generally a exploration of our relationship to lobsters, both historically and in the context of the Main Lobster Festival.

I hope you'll noticed that I haven't injected my own judgement into this. I also hope you'll at least read the first four paragraphs of the copied text below before skipping over the rest of it, should you choose.

This whole interchange takes place on Route 1, 30 July, during a four-mile, 50-minute ride from the airport11 to the dealership to sign car-rental papers. Several irreproducible segues down the road from the PETA anecdotes, Dick—whose son-in-law happens to be a professional lobsterman and one of the Main Eating Tent’s regular suppliers—articulates what he and his family feel is the crucial mitigating factor in the whole morality-of-boiling-lobsters-alive issue: “There’s a part of the brain in people and animals that lets us feel pain, and lobsters’ brains don’t have this part.”

Besides the fact that it’s incorrect in about 11 different ways, the main reason Dick’s statement is interesting is that its thesis is more or less echoed by the Festival’s own pronouncement on lobsters and pain, which is part of a Test Your Lobster IQ quiz that appears in the 2003 MLF program courtesy of the Maine Lobster Promotion Council: “The nervous system of a lobster is very simple, and is in fact most similar to the nervous system of the grasshopper. It is decentralized with no brain. There is no cerebral cortex, which in humans is the area of the brain that gives the experience of pain.”

Though it sounds more sophisticated, a lot of the neurology in this latter claim is still either false or fuzzy. The human cerebral cortex is the brain-part that deals with higher faculties like reason, metaphysical self-awareness, language, etc. Pain reception is known to be part of a much older and more primitive system of nociceptors and prostaglandins that are managed by the brain stem and thalamus. On the other hand, it is true that the cerebral cortex is involved in what’s variously called suffering, distress, or the emotional experience of pain—i.e., experiencing painful stimuli as unpleasant, very unpleasant, unbearable, and so on.

Before we go any further, let’s acknowledge that the questions of whether and how different kinds of animals feel pain, and of whether and why it might be justifiable to inflict pain on them in order to eat them, turn out to be extremely complex and difficult. And comparative neuroanatomy is only part of the problem. Since pain is a totally subjective mental experience, we do not have direct access to anyone or anything’s pain but our own; and even just the principles by which we can infer that others experience pain and have a legitimate interest in not feeling pain involve hard-core philosophy—metaphysics, epistemology, value theory, ethics. The fact that even the most highly evolved nonhuman mammals can’t use language to communicate with us about their subjective mental experience is only the first layer of additional complication in trying to extend our reasoning about pain and morality to animals. And everything gets progressively more abstract and convolved as we move farther and farther out from the higher-type mammals into cattle and swine and dogs and cats and rodents, and then birds and fish, and finally invertebrates like lobsters.

... later in the essay:

There happen to be two main criteria that most ethicists agree on for determining whether a living creature has the capacity to suffer and so has genuine interests that it may or may not be our moral duty to consider. One is how much of the neurological hardware required for pain-experience the animal comes equipped with—nociceptors, prostaglandins, neuronal opioid receptors, etc. The other criterion is whether the animal demonstrates behavior associated with pain. And it takes a lot of intellectual gymnastics and behaviorist hairsplitting not to see struggling, thrashing, and lid-clattering as just such pain-behavior. According to marine zoologists, it usually takes lobsters between 35 and 45 seconds to die in boiling water. (No source I could find talked about how long it takes them to die in superheated steam; one rather hopes it’s faster.)

There are, of course, other fairly common ways to kill your lobster on-site and so achieve maximum freshness. Some cooks’ practice is to drive a sharp heavy knife point-first into a spot just above the midpoint between the lobster’s eyestalks (more or less where the Third Eye is in human foreheads). This is alleged either to kill the lobster instantly or to render it insensate—and is said at least to eliminate the cowardice involved in throwing a creature into boiling water and then fleeing the room. As far as I can tell from talking to proponents of the knife-in-the-head method, the idea is that it’s more violent but ultimately more merciful, plus that a willingness to exert personal agency and accept responsibility for stabbing the lobster’s head honors the lobster somehow and entitles one to eat it. (There’s often a vague sort of Native American spirituality-of-the-hunt flavor to pro-knife arguments.) But the problem with the knife method is basic biology: Lobsters’ nervous systems operate off not one but several ganglia, a.k.a. nerve bundles, which are sort of wired in series and distributed all along the lobster’s underside, from stem to stern. And disabling only the frontal ganglion does not normally result in quick death or unconsciousness. Another alternative is to put the lobster in cold salt water and then very slowly bring it up to a full boil. Cooks who advocate this method are going mostly on the analogy to a frog, which can supposedly be kept from jumping out of a boiling pot by heating the water incrementally. In order to save a lot of research-summarizing, I’ll simply assure you that the analogy between frogs and lobsters turns out not to hold.