In the original context of why I brought qualia up: yes, it's 'evidence' of something naturalism cannot account for.
I don't see how or why this is so.
Brain activity can be measured; but how would one differentiate between a quale of red, and a quale of 'I enjoy red'? (unless the person communicated that of course)* Both instances would be voltages.
I think you have answered your own questions: I should imagine that the pattern of the voltages would be different. (I can't lay my hands on it now but thee is a post in the Science section that shows thoughts being translated into images - most interesting.)
However, and to accept your point on voltages, if qualia are brain activity and brain activity can be measured; what is your point?
So then; it's something beyond the scope of naturalism to account for.
No. This is an error on your part. Qualia are experienced by all of us, thus they are natural in that they are part of the function of the mind. Doubtless they are explicable, definable and, presently and to an extent, measurable.
One could call that 'supernatural'.
One could but one would be incorrect
I don't see why not.
I hope you see "why not" now.
Supernatural doesn't have to mean something magical or whatever, just beyond what the discipline can be used for imo....
Unfortunately it does have to mean that. Your having an opinion of a word's meaning is not much use, is it? E.g. If you meant Coca Cola each time you said Beer, things would not go well. We agree meanings of words, otherwise we have a private language, which is no language at all.
Oxford English Dictionary (full on-line edition v. March 2012)
Supernatural: That is above nature; belonging to a higher realm or system than that of nature; transcending the powers or the ordinary course of nature.
The very idea is that natures laws are not followed.
You may enjoy this from Alice Through the Looking Glass"
[Humpty-Dumpty speaks] 'And only one for birthday presents, you know. There's glory for you!'
'I don't know what you mean by "glory",' Alice said.
Humpty Dumpty smiled contemptuously. 'Of course you don't — till I tell you. I meant "there's a nice knock-down argument for you!"'
'But "glory" doesn't mean "a nice knock-down argument",' Alice objected.
'When I use a word,' Humpty Dumpty said, in rather a scornful tone, 'it means just what I choose it to mean — neither more nor less.'
Let's keep to real definitions. ; )