@PB
The psychologists of consciousness who speak of hallucination use it in a well-defined, limited way because the word has several meanings and uses including the one you mentioned. In translating a wavelength into a color, our brain gives us a way of seeing an apple, a leaf, a hunk of lapis lazuli, or anything in a way that allows us to make certain distinctions that just sensing vibrations qua vibrations probably would not. A cat sees a red apple without the color we know and the bat hears it rather than seeing it in a way that works for the bat.
Since you asked, the shivers I got had to do with the possibility of living with a parallel universe I may simply lack the sense organs to perceive. Like feeling there’s an unseen presence where perhaps other beings exist who might be unaware of me as well. That’s all.
I want to make clear that when I refer to a hallucination, I am not thinking of a simulation in the sense certain physicists use it. A simulation would mean we and our perceptions aren’t real. The hallucination I’m talking about is simply a way of presenting our surroundings to the consciousness in a way we can make sense of. That an apple isn’t the color red doesn’t deny the reality of the apple. I think Autumn was arguing that if red is a certain wavelength, then the apple is red if it gives off that value. I can see that point of view. I do think something is lost if one views it that way. My point is that red becomes a percept when our brain gives us a way of seeing it that we call red.
I don’t know what it’s like to be a bat, but I bet it can’t see red. It has no use for it.
