** Low Priority ** ** Reply Requested by 3/17/2012 (Saturday) ** yes 1 photon's enough - it remains unclear whether colors are photons.... נצח ישראל לא ישקר /begin/read__>sig.file: postal address palma University of KwaZulu-Natal Philosophy 3rd floor of Memorial Tower Building Howard College Campus Durban 4041 South Africa Tel off: [+27] 031 2601591 (sec: Mrs. Yolanda Hordyk) [+27] 031-2602292 Fax [+27] 031-2603031 mobile 07 62 36 23 91 calling from overseas +[27] 76 2362391 EMAIL: palma@xxxxxxxx EMAIL: palma@xxxxxxxxxx MY OFFICE # IS 290@Mtb *only when in Europe*: inst. J. Nicod 29 rue d'Ulm f-75005 paris france email me for details if needed at palma@xxxxxxxxxxxxxxxx ________ This e-mail message (and attachments) is confidential, and/or privileged and is intended for the use of the addressee only. If you are not the intended recipient of this e-mail you must not copy, distribute, take any action in reliance on it or disclose it to anyone. Any confidentiality or privilege is not waived or lost by reason of mistaken delivery to you. This entity is not responsible for any information not related to the business of this entity. If you received this e-mail in error please destroy the original and notify the sender. >>> Thomas Hart <tehart@xxxxxxx> 3/16/2012 11:33 PM >>> Color blindness is diagnosed through a test devised by Japanese scientists sometime prior to 1964. The test consists of looking at cards with a series of dots in various colors. The dots form numbers and against a differently colored pattern of dots that forms the background. If you are color blind, you cannot see the dots. If you can see the dots, you're not. In the retina of the eye are cells that are referred to as rods and cones. One set of cells sees white and black, and works at night as well as day. The other set is responsible for color vision, and if I recall correctly is made up of cells with red, green, and blue sensitivity, much like old CRT displays. If the cells that are sensitive to one of the colors are missing or deficient, color-blindness results. Unless I'm mistaken the eye can detect as little as one photon of light. At least these are my recollections from my psych class back in 1964. "One god I can understand, but one wife? It is not generous.... It is not civilized." Sheik Ilderim, Ben-Hur, 1959 Thomas Hart tehart@xxxxxxx On Mar 16, 2012, at 5:04 PM, Julie Krueger wrote: That very (red/green) thing is why I've never understood what exactly color-blindness is and how it's identified/diagnosed. Julie Krueger On Fri, Mar 16, 2012 at 3:13 PM, Walter C. Okshevsky <wokshevs@xxxxxx> wrote: Yes, specifying the colours serves to focus the question more clearly. But my epistemological conundrum remains. Imagine: What everybody calls and sees as "red," Walter sees as "green" but calls it "red" because everybody else does. And what everybody calls and sees "green" Walter sees and calls "red" because everybody else does. (Go figure, Robert Brandom.) In this scenario, which is logically and empirically possible, there does not seem to be a way of detecting this visual and linguistic discrepancy. But it remains an actual possibility. Perhaps something like Quine's "gavagai" example? Hoping that Dan soon learns you your coulours, Walter P.S. Re Palin/Obama: She's probably thinking she can get Obama to roll his eyes upwards a sufficient number of times during the debate to win it. If it worked for Al Gore vs George W, why not for her? Quoting Julie Krueger <juliereneb@xxxxxxxxx>: > Sorry -- sent privately when I intended to send to the list. That seems to > be the thing to do today. > > Julie Krueger > > Odd. Just today I had a conversational todo when I asked Dan if he liked > the new blue sheets. He asked where they were. On the bed. The gray > sheets?, he says. No, the blue sheets currently on the bed, says I. > > I understand there are lots of nuances of colors, hues, shades, tones, and > other such vagaries out there. I should have said that I would be > surprised if any child two years of age didn't know basic primary and > secondary colors -- red, blue, yellow, green, orange, purple. > > On a totally unrelated note, Palin has challenged Obama to a debate.... I > don't even know what to DO with that thought. > > Julie Krueger > > > > > > On Tue, Mar 13, 2012 at 8:45 PM, Walter C. Okshevsky <wokshevs@xxxxxx>wrote: > > > My wife insists that what I call "pale blue" is actually "grey." And she's > > quite > > amazed at how consistently I make that mistake. I'm equally amazed by the > > fact > > that what she sees as "grey" is actually "pale blue." Now I ask you, who > > here > > really "knows" their colours and who is mistaken? And don't forget that in > > Montreal, drivers understand that "yellow" is "green but be quick about > > it." > > > > Walter O > > MUN > > > > > > Quoting Julie Krueger <juliereneb@xxxxxxxxx>: > > > > > In my experience, children much, MUCH younger than 7 know their colors. > > > I'm surprised if children who are two don't. > > > > > > Julie Krueger > > > > > > > > > > > > > > > On Mon, Mar 12, 2012 at 8:27 PM, Andy <mimi.erva@xxxxxxxxx> wrote: > > > > > > > Why not? > > > > > > > > Andy > > > > > > > > > > > > *From:* Julie Krueger <juliereneb@xxxxxxxxx> > > > > *To:* lit-ideas@xxxxxxxxxxxxx > > > > *Sent:* Monday, March 12, 2012 8:41 PM > > > > *Subject:* [lit-ideas] Re: The Order of Aurality (ratification of > > > > fiction?) > > > > > > > > Surely you didn't mean to say quite this? > > > > > > > > Julie Krueger > > > > > > > > > > > > > > > > > > > > On Mon, Mar 12, 2012 at 5:41 PM, Andy <mimi.erva@xxxxxxxxx> wrote: > > > > > > > > I think abstract reasoning kicks in about at about age seven or so. > > Does > > > > a child that young even know colors? > > > > > > > > > > > > > > > > > > > > > > > > > > > > > This electronic communication is governed by the terms and conditions at > > > http://www.mun.ca/cc/policies/electronic_communications_disclaimer_2011.php > > > This electronic communication is governed by the terms and conditions at http://www.mun.ca/cc/policies/electronic_communications_disclaimer_2011.php Please find our Email Disclaimer here: http://www.ukzn.ac.za/disclaimer/