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Sorry, I haven't checked this thread in a while.
I think it comes down to the question: "When we have explained every physical function of the brain, have we explained all there is to subjectivity?" A physicalist would have to say yes, but I think there is more.
I'm not sure what you mean by subjective here.
Again, you'll have to elaborate. Are you saying the experiences are physical objects or processes? Or that they can affect physical processes? If so, I would have to disagree, although the second issue is a very difficult and subtle one. If you are saying they can be correlated to a physical process in a one-to-one mapping, I would agree.
And one more time, I think we have very different terminology. From what you've said since this post, I have the feeling you equate qualia with neural patterns. They are correlated, of course, but I would argue they are not the same thing. Qualia are the sensations we experience that are totally private. No one knows what the color red looks like to you, even though they can know the corresponding neural patterns. Physics is only capable of explaining structure (ie, geometry, patterns, organization) and function (cause and effect, behavior, etc.). The qualia debate centers around the idea that qualia are not completely accounted for by structure and function. Even if we explain every neural pattern, every action you could perform in response to a sensation, we don't know what it's like for you to be experiencing it.
moving finger said:Pardon my question, but I'm having trouble understanding exactly what you mean by the question : "are they real?"
Can you first please define exactly what you mean by "real"?
I think it comes down to the question: "When we have explained every physical function of the brain, have we explained all there is to subjectivity?" A physicalist would have to say yes, but I think there is more.
I guess the question is not the same as
1 Do sensory experiences have subjective properties?
(to which I hope all conscious and perceptive agents would answer "yes"?)
I'm not sure what you mean by subjective here.
Does it mean
2 Do these subjective properties have a physical embodiment?
(to which I hope all conscious and perceptive agents would also answer "yes"? - otherwise how could the subjective properties have any interaction with our physical consciousness?)
Again, you'll have to elaborate. Are you saying the experiences are physical objects or processes? Or that they can affect physical processes? If so, I would have to disagree, although the second issue is a very difficult and subtle one. If you are saying they can be correlated to a physical process in a one-to-one mapping, I would agree.
Or does it mean
3 Does the physical embodiment of these subjective properties exist independently of the conscious substrate, and identical in all brains/consciousnesses?
(to which I would answer "no")
And one more time, I think we have very different terminology. From what you've said since this post, I have the feeling you equate qualia with neural patterns. They are correlated, of course, but I would argue they are not the same thing. Qualia are the sensations we experience that are totally private. No one knows what the color red looks like to you, even though they can know the corresponding neural patterns. Physics is only capable of explaining structure (ie, geometry, patterns, organization) and function (cause and effect, behavior, etc.). The qualia debate centers around the idea that qualia are not completely accounted for by structure and function. Even if we explain every neural pattern, every action you could perform in response to a sensation, we don't know what it's like for you to be experiencing it.