• СЯУ животные 🦀
    The lobster does not have a centralize brain as is common in many animals. Instead, they have a bilaterally symmetrical nervous system, which consists of one ganglia (group of nerves) per body segment. These ganglia are joined together by a ventral nerve cord and perform different body functions.

    Lobsters react to sudden stimulus, like twitching their tails when placed in boiling water, but they don't have complex brains that allow them to process pain like humans and other animals do. ... The research on whether or not these creatures feel pain, however, is still inconclusive.

Replies (1)

  • @lurker,
    Actually, they just might. That’s the conclusion of a new study published in the Journal of Experimental Biology. Robert Elwood and Barry Magee of Queen’s University in Belfast examined the reaction of common shore crabs — a close relation to the crabs that end up on our dinner plate — to small electrical shocks. Ninety crabs were individually placed in a brightly lit area and were given the option of scuttling to one of two dark shelters. (Shore crabs, like many crustaceans, like to hide in dark, tight spaces.) Once they’d made their choice, the crabs in one of the shelters were exposed to an electric shock. After a rest period, the crabs were returned to the lit tank. Most of the crabs went back into the dark shelters, and then the same crabs were given another electric shock. (Science, like cooking, can sometimes seem cruel.) When they were placed back into the lit tank for the third time, the majority of the shocked crabs instead went to the alternative dark shelter, avoiding the one where they had repeatedly been shocked.

    Having experienced two rounds of shocks, the crabs learned to avoid the shelter where they received the shock. They were willing to give up their hideaway in order to avoid the source of their probable pain.

    The design of the experiment is clever, and it had to be. It’s not easy to detect whether a voiceless invertebrate like a crab is feeling anything like what we might call pain. The key is the change in behavior. If you prick a live crab, it will bleed, but more to the point, it will react. But that’s a reflex action — known as nociception — that’s found in nearly every animal. But for the crab to feel the unpleasant effects of the shock, remember where it came from and then change its behavior to avoid that effect, indicates it may indeed be feeling something closer to pain. “I don’t know what goes on in a crab’s mind … but what I can say is the whole behavior goes beyond a straightforward reflex response and it fits all the criteria of pain,” Elwood told the BBC.