Why, it doesn't work the same way as humans, even if you use the same materials. Sure, you can have sensors that send signals to a central system; but what it does with them is up to the programming. And we have no clue about that, in humans and animals - that the same general area responds doesn't mean the same method is used. With a robot, we can have the same output (nursing a wound etc), the same structure at certain abstraction levels (aka if we aren't looking at the lines of code directly; which we aren't doing with animals and humans either), and the same input; yet there could still be no pain - in fact, pain is added complexity. And we know that there's no pain because we wrote it that way.
Now, is the animal like the robot or like the human? Structural comparisons are taboo, because the robot and the human are the same, as long as we aren't looking at the lines of code, which we can't do at our current tech level. Comparisons of output are also taboo - the robot moves away and shouts to signal other robots the same way a human does. Comparisons of programming are impossible - we don't have the means to see the programming of an animal. And hence we come to speculating about that programming. Would an animal have the programming to feel pain (remember, pain is extra complexity!)? On one hand, a cow has common ancestors with a human, albeit at a very distant level in the evolutionary chain. Pain didn't appear magically, it was incrementally developed - the process might have started with mammals, or it might have started with monkeys, excluding cows (and again; pain didn't appear magically; animals from the start of the process, lets assume cows, would feel much less pain than those at the end, namely humans). It probably didn't start with fish in any case. Would it have been an evolutionary advantage for cows to have? Probably not. They don't have the willpower to need it; a cow without pain will react in the same to being informed that it should run/attack like one with pain. Except that the one with pain will be using up brain cycles for that pain, and on top of that would be crippled in its response. A cow without pain would have the same reaction as a cow with pain...except without all the drawbacks of pain (humans tend to not react very accurately, quickly, when in pain, and at certain levels we can't do anything at all). Hence, any cow mutations that introduce pain would probably die off due to being less fit.
Now, is the animal like the robot or like the human? Structural comparisons are taboo, because the robot and the human are the same, as long as we aren't looking at the lines of code, which we can't do at our current tech level. Comparisons of output are also taboo - the robot moves away and shouts to signal other robots the same way a human does. Comparisons of programming are impossible - we don't have the means to see the programming of an animal. And hence we come to speculating about that programming. Would an animal have the programming to feel pain (remember, pain is extra complexity!)? On one hand, a cow has common ancestors with a human, albeit at a very distant level in the evolutionary chain. Pain didn't appear magically, it was incrementally developed - the process might have started with mammals, or it might have started with monkeys, excluding cows (and again; pain didn't appear magically; animals from the start of the process, lets assume cows, would feel much less pain than those at the end, namely humans). It probably didn't start with fish in any case. Would it have been an evolutionary advantage for cows to have? Probably not. They don't have the willpower to need it; a cow without pain will react in the same to being informed that it should run/attack like one with pain. Except that the one with pain will be using up brain cycles for that pain, and on top of that would be crippled in its response. A cow without pain would have the same reaction as a cow with pain...except without all the drawbacks of pain (humans tend to not react very accurately, quickly, when in pain, and at certain levels we can't do anything at all). Hence, any cow mutations that introduce pain would probably die off due to being less fit.
Edited: 2012-12-03, 10:08 am

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Viva la Patriot Act.