erislover,
Here is an example of the lost threads posted from Straightdope on 12-7-01. I didn’t want to post all of it because it is just to long much like this thread!
Is this what you wanted. Just wondering.
Pochacco
Member
Registered: Jun 2000
Posts: 93 quote:
Originally by Spiritus Mundi
quote:
This is why we have three primary colors. If we had four types of cones in our eyes, there would be four primary colors. Color is very anthrocentric.
Nitpick alert:
The sensitivity of the three types of cones does not align with the three primary colors folks learned in art class (blue-red-yellow, the primary colors of pigment) but are generally associated with the primary colors of light (blue-green-red).
In fact, the “red” cones actually have their peak of sensitivity in the “yellow-orange” part of the spectrum.
But I wasn’t saying that the peak sensitivity of the cones lines up with the primaries. What I was pointing out was that because the eye has three types of receptors you have to have three primary colors in system of color reproduction. What those primaries are depends upon the physical properties of the system.
If the eye had four types of primaries (instead of three) schoolchildren would learn about the four primary colors of pigment.
12-07-2001 08:57 AM
Spiritus Mundi
Member
Registered: Nov 1999
Posts: 3165 DSeid
quote:
By the standards of the initial quote I must be a nominalist, but I don’t believe what Spiritus says nominalists believe. Hmmm.
Really? Perhaps you could tell me what part of the nominalist position (as I have discussed it) you are in disagreement with.
quote:
Patterns exist.
I think this mught be the source of the confusion. In what manner do you believe that patterns exist?
Do you, like Abelard, find for them a special existence as human conception?
Do you, like most nominalists, find no objective existence for them at all asking, “Where is spiral? Can you point to zig-zag?”
Or do you, like myself, find that some patterns are inherent in the structure of reality and thus have the same claim to “existence” as any particular manifestation of matter or energy?
quote:
So called “universals” and so called “particulars” are both our models of the world formed from our the filtered products of our perception. Ways to classify our perceptions of reality.
Do you see no difference, then, between the types of “filtration” for each? If not, how do you argue that one has an existing referent while the other does not?
quote:
Length? We percieve length with our senses - sight, touch.
So we perceive it directly yet it is not real. How, then, do you argue that other things which we perceive directly are real?
quote:
We infer from past experience that a set of perceptions will change in this dimension in predictable ways. This inference is a model of the world and has been a reliable one, I entirely expect it to continue to be so, but that does not make it a “universal”.
Perhaps you are finding an implication in the word “universal” which is absent from the standard form of this debate. The OP contains a fairly clear treatment of the “universal::particular” dichotomy. If a word is predicable, if the concept behind the word can be common to many things, then it is a “universal”.
That is the definition of the word in this context.
quote:
“Universals” are inferential from particulars, not deductive.
They can be either. From a given logical structure I might deduce that “DSeid is a physician.” Every element of that statement can be viewed as a universal. “[DSeid-identity] [group membership] (or [equivalence]) [physician]”
Pochacco
Well, I warned that it was a nitpick. I didn’t actually disagree with your 1-to-1 relationship between types of cone sensitivity and primary color (though it is conceivable that a 4th type of cone could have it’s sensitivity “nested” entirely within the range of one of the present 3. This would afford greater differentiation between hues in that range, but it would not necessitate a 4th “primary ocolor” to represent.
Hey, it was just a little hijack because I’ve always found color perception to be fascinating.
12-07-2001 09:10 AM