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_Marteue_ OP t1_j96jk6i wrote

Replying to [deleted] (#1,871,481)

Thanks a lot for the reply! Do you think it's reasonable to assume that all arthropods feel pain, if studies show some arthropods do? After all, they probably all came from the single ancestor? How probable would it be that only a few orders (or species) of them evolved this reaction to painful stimuli?

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BeneficialWarrant t1_j9746la wrote

As far as I'm aware, we don't have a good way of objectively describing, measuring, or comparing a subjective "experience". We know that they can detect a nociceptive (painful) stimulus and change their behavior to avoid the stimulus. We can even accurately simulate the entire nervous system of some simple arthropods in a computer program and completely understand how they process information and "think". Despite this, I don't think we can know if they suffer.

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BeneficialWarrant t1_j9823fl wrote

Replying to buddhistbatrachian (#1,876,310)

I'm sorry, I only remember reading about a complete C. elegans simulation with 302 neurons several years ago and assumed that more advanced simulations have since been run. I actually don't know for sure and haven't looked into it since. I apologize if that was misleading.

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uwuGod t1_j99q8c7 wrote

The way I understand it, most small insects don't really "suffer" pain, although they might feel it. But with how simple their nervous systems are, they're more like machines than anything. When an ant loses a leg, for example, it doesn't sit there and writhe in pain like a human would. It asses the damage, searches for the source of the damage, and if the source is a threat, it runs away from it.

It's the difference between, "Aagh my leg aaah!!," and, "Limb no. 4 out of service. evaluating threat level... calculating next best move." ...so we think.

Of course, no way to know for sure. But larger arthropods seem to "suffer" more. Stabbing a millipede will make it writhe and squirm (not that I've done that on purpose... blame little kids for that). Pet tarantulas also seem to suffer mental stress - a tarantula that's constantly startled, threatened, or lightly injured will have a shorter lifespan, even when physically they're fine.

Then again, I've seen videos of beetles that have lost almost all their organs that keep walking like nothing happened, or wild spiders with 4 legs missing that still live normal lives. It's really hard to say for sure.

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