The oyster
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The structure of the mantle consists of a sheet of connective tissue containing muscles, blood vessels, nerves and it is covered on both sides by epithelium. The mantle receives sensory stimuli, and conveys them to the nervous system and aid in the shedding and dispersal of eggs. [...]The nerve provides communication. Close nerve contact is maintained between the muscles and the organs of the mantle through a fine nerve network.
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From what I read, it seems that the oyster doesn't have any central nerve system which could be used to store experiences, memories or process nerve stimuli, but I can't draw a line to say if it "feels" pain or not. What is "pain", actually? Isn't it a human concept?(not rethorical question).
BTW, I enjoy eating oysters, fresh ones with some drops of lemon juice. Sometimes you can even see it reacting to the juice, before you detach it from it's shell and swallow it...
