Paul C. Anagnostopoulos said:
Indeed. The blindsighted person can see red objects, but does not experience "redness." So then let's say that it is this redness that philosophers refer to as qualia, and that this qualia is causally inefficacious. That is the best I can do to understand what they are talking about regarding epiphenomenalism.
So, if qualia are truly causually inefficacious, we would have no way to talk about this redness, yet we are.
~~ Paul
How can a blind-sighted person see red objects? A better way of putting it would be that a person born with normal vision would both see red objects and experience the quale of redness. If that person later in life lost their sight (let's say something terrible happened to their eyes, not a result of something wrong with their brain that processes info from their eyes) then that person would not be able to see red, but could still experience redness in their imagination.
Instead of the blind-sighted person, let's consider a mechanical device. We set up a machine with a light sensor that reads the light waves and if the light waves are within the red spectrum it returns a response of "red". So we know the exact causality of this machine. You put a red card in front of it, and it says "red". So we can say that the machine "knows" when it sees red.
Now if you put a red card in front of my eyes and ask me what color it is, I also say respond "red". So I also "know" when I see red. But I also seem to experience this epiphenomenona quale of "seeing redness". There are four possible answers:
1) I experience the quale of "seeing redness" which has a causal effect of me "knowing" that the card is red.
2) The light waves received by my eyes are processed in my brain such that my brain "knows" that the card is red, but there is also a quale of "seeing redness" that is non-causal.
3) The light waves received by my eyes are processed in my brain such that my brain "knows" that the card is red AND causes my brain to believe that it experienced a quale of "seeing redness".
4) The light waves received by my eyes are processed in my brain such that my brain "knows" that the card is red and there is no quale of "seeing redness".
To address these possibilities (out of order):
4) The problem that you mentioned is with number 4: if there is there is no quale of "seeing redness", we would have no way to talk about this redness, yet we are. The issue is that we really, really, really DO seem to experience "redness" just as we experience "pain" and so forth. Try hitting your thumb with a hammer or holding your hand on a hot stove and tell me you just have neurological responses and don't "feel pain". So your argument is actually FOR epiphenomenalism: if qualia did not exist then we would have no way to talk about them, but we do therefore the epiphenomenona of qualia must exist.
2) Number 2 has similar problems, but not as severe: if the explanation for behavior and knowledge is based on causal effects, and the by-product quale of "seeing redness" is non-causal, how can the brain be caused to be aware of them and react to them? In other words, why are we talking about them if they have no causal effect that would cause our brains to talk about them? There would have to be SOME causal effect.
1) For number 1: This would explain why we have a way to talk about this redness, but requires that these qualia are truly causally efficacious. This experience of "redness" is the same as experience of "self" (or "soul" or "mind") and so raises the problems of dualism.
3) So we are left with option 3: This is the option that I support. The causality in my eyes and brain are exactly the same as the causality in the mechanical machine. The difference is that my brain is sufficiently complex to create a “consciousness†that can create a quale of “rednessâ€. But both the consciousness and corresponding quale are illusions--constructs created by neurological phenomenon that are necessary to process the data of those phenomenon. Much like there is no such thing as the number two. There is no thing that exists that is “the number twoâ€. It is just an illusion or construct created by my brain to process the data of phenomenon. It isn’t something that really “existsâ€, just as “rednessâ€, “painâ€, and “self†(or “soul†or “mindâ€) don’t really exist. There are not really any epiphenomenona. They are not phenomenon that have causal effectiveness, but constructs of phenomenon used to analyze those phenomenon.
Of course that leaves big tough questions: How can certain phenomenon create awareness of and constructs of that phenomenon? That seems to beg the question of “what is consciousness/self/mind/soul†if it is NOT an epiphenomenonon? But actually it eliminates the possibility of epiphenomenonon, and asks for other answers. I don’t know what they are, but I think that there are some answers these questions that are not dependent on epiphenomenononalism.
I'm quite rusty on philosopy, but I hope this helps in some way.
