A new animal protection law in Switzerland requires that lobsters be stunned before being cooked.

Animal rights activists and some scientists argue that lobsters' central nervous systems are complex enough that they can feel pain.

There is no conclusive evidence about whether lobsters can feel pain.

People are more sensitive about killing lobsters than other animals.

Few diners cringe at the thought of a fish slowly suffocating to death, for instance, but there is considerable more stress associated with dropping Maine's icon into a pot of boiling water.

In Switzerland, a new animal protection law that will take effect in March requires that lobsters be stunned before they are killed.

But the research on whether or not these creatures feel pain is still inconclusive.

The Lobster Institute in Maine argues that the lobster's primitive nervous system is most similar to the nervous system of an insect. And while lobsters react to sudden stimulus, like twitching their tails when placed in boiling water, the institute suggests that they do not have complex brains that allow them to process pain like humans and other animals do.

"Cooking a lobster is like cooking a big bug," said Robert Bayer, executive director of the Lobster Institute. He added: "Do you have the same concern when you kill a fly or a mosquito?"

In 2014, a scientist from Queen's University in Belfast argued that lobsters and other crustaceans probably do feel pain, on the grounds that crabs in a study learned to avoid a hideaway where they were repeatedly given an electric shock.

A Norwegian study from 2005 concluded the opposite: lobsters do not have brains, so they do not feel pain.

However, most consumers still don't see it that way.

Lobsters inspire more compassion than chicken, pigs, or other fish because it is one of the few foods that urbanites have to kill themselves when cooking.

In 2006, Whole Foods banned the sale of live lobsters and crabs in its stores — with the exception of those in Maine — citing that transporting, storing, and cooking live animals was inhumane. In 2013, a video released by PETA that showed live lobsters being ripped apart by hand at a Maine processor again struck a chord with animal rights groups.

We will never know how the lobster feels. That's why the Lobster Institute focuses on ways to cook lobster so that "it minimizes our own trauma," said Bayer.

He suggested putting the lobster in either fresh cold water or chilling it in the freezer (without freezing it) before cooking. Both methods, according to Bayer, will "put the lobster to sleep."

One Maine processor uses an 80,000-pound machine called the "Big Mother Shucker" to kill lobsters in just six seconds using high water pressure.

Another option is the CrustaStun, a device that home chefs can purchase for several thousand dollars to "zap lobster's nervous system in one jolt," said Trevor Corson, author of "The Secret Life of Lobsters."

A large kitchen knife will also make for a quick death when cooks hold the lobster upside down and slice it in half from the tail to the head. Corson provides step-by-step instructions for this method on his blog.

As for the most humane way to kill a lobster, "there's no absolute answer," said Bayer. It's based on what we perceive as pain or perhaps hear as "screams," even if those sounds are just the steam escaping the lobster's shell.