Lewis's Two Forms of Pain
The being with "mad pain" is a human being, except when his brain is in a state of pain, his mind turns to mathematics and he begins to snap his fingers. He is not at all inclined to prevent the pain from occurring. Lewis ultimately goes on to explain that pain is relative to a species, implying that the man who exhibits mad pain is essentially an exception. He is in pain because, instantiated in him, it is that physical state which is normally an instantiation of pain in his species (humans). In Lewis' words, "In short, he feels pain but his pain does not at all occupy the typical causal role of pain."
A being with "Martian pain" is not human but, when subject to pain, will react in the same way that humans do. He is strongly inclined to prevent whatever stimulus is causing discomfort. However, the physical explanation of Martian pain is different from that of human pain. He has a "hydraulic mind" and pain is identical with inflation of cavities in his feet. Lewis suggests that the Martian is indeed in pain, because, instantiated in him is the filler of the relevant physical instantiation of pain in that species: inflation of the cavities in the feet. In Lewis' words, "In short, he feels pain but lacks the bodily states that either are in pain or else accompany it in us."
Read more about this topic: Mad Pain And Martian Pain
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