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From: markrose@spss.com (Mark Rosenfelder)
Subject: Re: Qualia (was Re: Minsky's new article)
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References: <19941116.150347.522@almaden.ibm.com> <3aj0om$1kf@tadpole.fc.hp.com> <3alr5q$g1s@crl2.crl.com> <PJG.94Nov21161240@tesla.esl.com>
Date: Wed, 23 Nov 1994 18:42:09 GMT
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Xref: glinda.oz.cs.cmu.edu comp.ai.philosophy:22509 comp.ai:25434 comp.robotics:15606

In article <PJG.94Nov21161240@tesla.esl.com>,
Paul Gyugyi <pjg@tesla.esl.com> wrote:
>In article <3alr5q$g1s@crl2.crl.com> dbennett@crl.com (Andrea Chen) writes:
>   I like Brent Allsops article a lot and think he has touched on
>   important things.  I would like however to add some complexity
>   to the events he described.  I take one statement "We most
>   definitly directly know what the yellow in our minds is
>   fundamentally like."
>
>When I see yellow on my CRT, it is really red and green photons
>stimulating my retina at the same time.  

But you'll also see yellow when yellow (577 nm) photons stimulate it.

>The eye doesn't really
>ever "see" "yellow".  It has red and green sensors that, if both
>are stimulated, blend the signals to be yellow.  

Your color theory is about forty years out of date.  The eye does see
yellow; although there are only three types of cones, there are four types
of color response-- red, green, yellow, and blue.  

The "red" and "green" cones are really misnomers; the peak of the "red"
cones' response is at about 560 nm-- yellow-green.  The eye sees red and
green by subtracting the responses of the low- and medium-wavelength cones,
while yellow and blue are combinations of all three cone types (roughly
low + medium - short).
