They do have brains actually, I think the marketing folks at The Lobster Institute are streching the truth so more people won't feel guilty about eating our yummy little friends. They are small and primative, but they are a "brain". Food tastes better when you know that it suffered.
I used to dive for them. They can swim away PDQ. In three seconds, they're so far away, it's not worth the air to swim
after them, hoping they'd set down.
And they really know how to wedge themselves in crevices.
Again, no, they don't have a brain. The central ganglion has a bulb behind the lobster's eyes that principally houses the nerve bundles that handle vision. The processes that make up this section of the central ganglion account for 60% of the weight of the central ganglion. In other words, what gets mistaken for a 'brain" is the optic nerves! Incidentally, there are no receptors that can handle much beyond vision cues. I know. I looked for them. For 2 years.
Also, the Lobster Institute is made up of scientists, not marketing people or lobstermen.