[ExI] are qualia communicable? Was Why stop at glutamate?

[efc at swisscows.email]

On Fri, 14 Apr 2023, Brent Allsop via extropy-chat wrote:

> You identify whatever P1, glutamate, or whatever it is that is the objective description of a subjective pixel with a redness
> quality.  Then, if you see one person representing red light with that, and the other representing green light with that, you can
> then say in an objectively grounded way:
> 
> His redness(p1) is like the other's greenness(also p1), which you both call red.

Hello Brent,

Just to summarize your position for myself...

Do I understand you correctly then, if I think you say that despite that
brain scans in different people show different activity (they might
overlap to a big extent, but due to the nature of each individual brain,
there will always be a difference), somewhere in the overlapping areas
that are active, you are saying that one fixed neuron or area represents
"red" objectively, and that everywhere and everyone (who is human) where
that area is active has the experience of "red"?

And further, if those areas light up in two people, you can say more
than just "the effects indicate redness), in fact you can say, they are
now experiencing the same thing?

And when it comes to proving this, you think experiments can be designed
to do that?

Sorry for any misrepresentation, but this is my understanding of what I
think you are saying. Please correct me if I am wrong.

Best regards, 
Daniel