Sydney, why exactly do you want to know more about Oyster's nervous system? I suppose it is to find out if they feel pain or not, and therefore know if it is wrong or right to eat them. But I can't see clearly the conection here.
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No, (pain ) is a word humans use to name the unpleasant sensations associated with tissue damage.
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What exactly is considered an unpleasant sensation? How do you catrgorize an unpleasant sensation? Isn't it another human concept? You could say that a stimulus causes unpleasant sensations if the animal tries to avoid it, because it can cause tissue damage. Could it be a just a simple response to stimuli developed through the evolution of the animal's species, comparable to how a venus fly trap entombs an insect?
Sorry about all the questions above. I'm not trying to be confrontational, I'm just trying to understand your point of view.