Deuteranopia is a type of red-green color blindness characterized by the inability to distinguish red and green pigments. Protanopia is another type of red-green color deficiency. Both are primarily caused by recessive genes in the X chromosome -(link)
More unusual is total colour blindness, achromatapsia - link. I shared a chemistry lab bench with a lad who was completely colour blind, which meant I ended up telling him the point of change whenever we were titrating using a coloured indicator. He and his brothers all had the same condition and were studied extensively. It was fascinating asking him what he saw because he couldn't describe it at all.
It won't just be him who can't describe it. With the exception of a statement as to the wavelength of the light of that colour, I defy anyone to come up with a description of a colour (say 'red') which doesn't amount to 'red is the colour of <fire or an apple or some other red thing>'. Otherwise, we're in the same world as when we talk about the ultraviolet or the infrared or radio waves or any other electromagnetic radiation that the nerves in our eyes don't pick up.
I wouldn't expect someone to be be seeing what I think of as red and calling it blue.
I think this is because - in practice if not in principle - we learn colours by being shown things of that colour: 'look at that red fire engine' leads an individual to believe that the colour that they perceive the fire engine to be is known as 'red'. But that doesn't mean that the colour that they perceive is the same as the colour that anyone else perceives. I've heard an anecdote of someone seeing a (ginger?) cat and exclaiming 'what a lovely green cat!' - because on the basis of their colour perception, the cat was the same perceived colour as grass, and they'd been told that grass was green.
That sounds to me exactly like the most common kind of colour blindness - red/green, which is a different kind of thing - colours that look different to each other to people with normal colour vision looking the same to colour-blind individuals. My eldest has the this and to him everything from red to green (via ginger cats) looks much the same. Before he was diagnosed we wondered why he loved blue so much. It's not surprising when everything else looks orangey brown.
Thank you for supplying a couple of words which had dropped out of my use in the 1980s. I knew that they were there, but had to work round titration and indicator. (Actually, I don't think titration was involved, as my mental replay doesn't have the kit for that. But I used up all the indicator - I had assumed that spring waters from the Chalk and from the Greensand would have different pH.)
A reminder that Trump corrupts everyone and everything he comes in contact with, his post-election legal team ("the Kraken") seem to be having a very bad day in court today. The context is that they're being subjected to a disciplinary hearing for filing suits in bad faith with "facts" the attorneys allegedly knew at the time of trial to be false.
For those who want a more freewheeling discussion of the hearing not constrained by Reuters' stylebook, there's this Twitter thread. A sample:
Judge Linda Parker tried to cut off Howard Kleinhendler, one of the Kraken lawyers, and he said to her: "just one second." She did *not* like that. "I'm moving on," she said to him.
He was trying to explain that a formatting error led to the complaint being almost unreadable.
ETA: it's easy to imagine an experiment where people are shown monochromatic and composite light, and ask to say which composite light is "the same colour as" the monochromatic one. And I think that has to expose differences in chromatic sensitivity between people. I don't know if it's been done, though - I suspect it has.
Some time with Mr. Google reveals that this sort of thing has indeed been done - in this Nature article, for example. The procedure consisted of alternating a "standard yellow light" with a blend of red and green, and adjusting the blend until the viewer thought the colour matched the yellow. Among other things, this paper reports a systematic difference between male and female colour perception in people with "normal" colour vision.
You mean like light in the ~480nm wavelength range? As opposed to a subjective and variable perception of colour based on the wavelengths of light reflected by an object filtered through the eyes and interpreted differently by each brain?
There would be nothing special about ~480nm if it weren't that people's subjective and variable perception of colour largely agrees in finding electromagnetic radiation of that wavelength a clear case of blue. The significance of that particular number derives from the significance of blue in human life rather than the other way around.
I've also seen TANGERINE, which is a colour you can't satisfactorily produce with a single wavelength of light, and brings us back to the ex-president in question.
A reminder that Trump corrupts everyone and everything he comes in contact with, his post-election legal team ("the Kraken") seem to be having a very bad day in court today. The context is that they're being subjected to a disciplinary hearing for filing suits in bad faith with "facts" the attorneys allegedly knew at the time of trial to be false.
For those who want a more freewheeling discussion of the hearing not constrained by Reuters' stylebook, there's this Twitter thread. A sample:
Judge Linda Parker tried to cut off Howard Kleinhendler, one of the Kraken lawyers, and he said to her: "just one second." She did *not* like that. "I'm moving on," she said to him.
He was trying to explain that a formatting error led to the complaint being almost unreadable.
I read somewhere that one of the lawyers broke down in Court, but not Powell or the other leaders. I don't know how junior the lawyers assisting were, but it used to be common for very young lawyers in corporate firms to do the grunt work while the seniors set direction and gave final approval. It takes a strong-minded person to make an ethical stand before they have found their feet in a profession. I don't think I could do it. I'd be sobbing at the bar table too.
She's also going with "I'm not crying, you're crying":
“Kraken” lawyer Julia Haller is adamant that she didn’t actually cry during a sanctions hearing in Michigan on Monday, but there were times as her voice quavered and cracked that she sounded close.
On Haller's background:
Haller's LinkedIn profile says she's a "litigator with over twenty years of experience in case strategy, complex matters, trials and administrative proceedings." Currently in private practice, she did stints during the Trump administration at the Department of Homeland Security, the Department of Housing and Urban Development and the White House.
She's also going with "I'm not crying, you're crying":
“Kraken” lawyer Julia Haller is adamant that she didn’t actually cry during a sanctions hearing in Michigan on Monday, but there were times as her voice quavered and cracked that she sounded close.
On Haller's background:
Haller's LinkedIn profile says she's a "litigator with over twenty years of experience in case strategy, complex matters, trials and administrative proceedings." Currently in private practice, she did stints during the Trump administration at the Department of Homeland Security, the Department of Housing and Urban Development and the White House.
I don't think it matters whether she's crying or not. I do think it matters that her answer to everything but EVERYTHING was, "just give us an evidentiary hearing and we promise we'll make complete sense of all this." Which was not what the judge was asking at all (Yes, I did listen, like at least 12K other people).
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It won't just be him who can't describe it. With the exception of a statement as to the wavelength of the light of that colour, I defy anyone to come up with a description of a colour (say 'red') which doesn't amount to 'red is the colour of <fire or an apple or some other red thing>'. Otherwise, we're in the same world as when we talk about the ultraviolet or the infrared or radio waves or any other electromagnetic radiation that the nerves in our eyes don't pick up.
That sounds to me exactly like the most common kind of colour blindness - red/green, which is a different kind of thing - colours that look different to each other to people with normal colour vision looking the same to colour-blind individuals. My eldest has the this and to him everything from red to green (via ginger cats) looks much the same. Before he was diagnosed we wondered why he loved blue so much. It's not surprising when everything else looks orangey brown.
For those who want a more freewheeling discussion of the hearing not constrained by Reuters' stylebook, there's this Twitter thread. A sample:
Another liveTweet: Part I and Part II.
Some time with Mr. Google reveals that this sort of thing has indeed been done - in this Nature article, for example. The procedure consisted of alternating a "standard yellow light" with a blend of red and green, and adjusting the blend until the viewer thought the colour matched the yellow. Among other things, this paper reports a systematic difference between male and female colour perception in people with "normal" colour vision.
I read somewhere that one of the lawyers broke down in Court, but not Powell or the other leaders. I don't know how junior the lawyers assisting were, but it used to be common for very young lawyers in corporate firms to do the grunt work while the seniors set direction and gave final approval. It takes a strong-minded person to make an ethical stand before they have found their feet in a profession. I don't think I could do it. I'd be sobbing at the bar table too.
She's also going with "I'm not crying, you're crying":
On Haller's background:
In other words, she's not a "very young lawyer in corporate firms [ doing ] the grunt work".
I went to the LinkedIn site as well. I ended up wondering how much of what it said was padded,
Clean Up on Aisle 45 (Episode 26)