I think I am getting the meaning of qualia a bit better, now:
You, I and the augmented blind person all experience red. It's essentially the same experience, because the red we observe is (presumably) the same.
From this each of us gain a memory experience, a quale, of that particular red.
What is meant by the term quale and qualia are the
actual experiences of seeing red you all are having when you're having them. If you gain a memory experience and visualize it in your mind's eye, that's also a quale
when you are doing the actual visualizing. For example, I can tell someone to visualize blue and they'll visualize blue. Then I can ask them whether it is more of a sky blue or a VISA credit card blue, or a SKYY vodka bottle blue. What we're discussing are aspects of the quale.
Another way to think of it for most people is they feel that they exist somewhere behind their eyes. They call this entity "I" or "me". I think this entity is an illusion of sorts, but that is a digression. So this self has first person impressions and experiences almost as if it's watching a move of reality or something similar. These are what are called qualia. Sometimes we know they're not representative of reality, as in optical illusions or in the case where a 'red' sweater looks a different color under different lighting. Some of us, unlike Darat if we understand each other correctly, can play a made up movie on our own like in the example of blue which i gave above. These are also qualia because we are having the experience of seeing red, but without actually seeing red. In other words, there is nothing red in the external world we are looking at.
If you're familiar with the work of Kant, he referred to the noumenal word (or things as they really were) versus the phenomenal world (things as we directly experience them, mediated by our senses). We
know the phenomenal world is not the same as the noumenal world. Not by a long shot.
In most cases you can just use that sense of the word phenomena as an analogue to qualia, with the additional understanding that many of us don't need the external world noumenon to experience the qualia.
Those may be different, as our observation channels (eyes, added technology) are not identical, and we cannot readily compare them.
- In fact methods can be deviced that allow for some comparison of many kinds of qualia, but it may never be an exact science.
I think we may never be able to observe them in principle. Our qualia may be wildly different and it would not matter in the external world. The
inverted spectrum thought experiment is only one example of this.
Also, many on here keep insisting that qualia are 'really just atoms' or 'chemical processes' in the brain. I haven't read the entire thread, but there is nothing about using the word qualia that commits or even encourages one to believe in any particular explanation of what they are or represent.