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Is Your Red The Same as My Red
Hey, Vsauce. Michael here. This appears blue. This appears yellow.And this appears green. Those of us with normal color vision can probably agree.But that doesn't change the fact that color is an illusion. Color, as we know it, does not exist in theoutside world, beyond us, like gravity or protons do. Instead, color is created insideour heads. Our brains convert a certain range of the electromagnetic spectrum into color.I can measure the wavelength of radiation, but I can't measure or observethe experience of a color inside your mind. So, how do I know that when you and me lookat a strawberry, and, in my brain, this perception
occurs, which I call quot;red,quot; that, in yourbrain, a perception like this doesn't occur, which you have, of course, also learned tocall red. We both call it red. We communicate effectively and walk away, never knowing justhow different each of our internal experiences really were. Of course, we already know that not everybodysees color in exactly the same way. One example would be color blindness. But we can diagnoseand discuss these differences because people with the conditions fail to see things that most of us can. Conceivably though, there could be ways ofseeing that we use that cause colors to look
differently in different people's minds, withoutaltering their performances on any tests we could come up with. Of course, if that were the case, wouldn'tsome people think other colors look better than othersé Or that some colors were morecomplimentary of othersé Well, yeah, but doesn't that already happené This matters because it shows how fundamentally,in terms of our perceptions, we are all alone in our minds. Let's say I met an alien from a far away solarsystem who, lucky enough, could speak English,
but had never, and could never, feel pain.I could explain to the alien that pain is sent through A delta and C fibers to the spinalchord. The alien could learn every single cell and pathway and process and chemicalinvolved in the feeling of pain. The alien could pass a biology exam about pain andbelieve that pain, to us, generally is a bad thing. But no matter how much he learned, the alienwould never actually feel pain. Philosophers call these ineffable, raw feelings quot;Qualia.quot;And our inability to connect physical phenomenon to these raw feelings, our inability to explainand share our own internal qualia is known
as the quot;Explanatory Gap.quot; This gap is confrontedwhen describing color to someone who's been blind their entire life. Tommy Edison has never been able to see.He has a YouTube channel where he describes what being blind is like. It's an amazing channel.In one tutorial he talks about colors and how strange and foreign of a concept it seemsto him. Sighted people try to explain, for instance, that red is quot;hot,quot; and blue is quot;cold.quot;But to someone who has never seen a single color, that just seems weird. And, as he explains,it has never caused him to finally see a color. Some philosophers, like Daniel Dennett, arguethat qualia may be private and ineffable simply
because of a failure of our own language,not because they are necessarily always going to be impossible to share. There may be an alien race that communicatesin a language that causes colors to appear in your brain without your retina having tobe involved at all. Or without you having to have ever needed to actually see the coloryourself. Perhaps, even in English, he says, given millions and billions of words usedin just the right way, it may be possible to adequately describe a color such that ablind person could see it for the first time. Or you could figure out that, onceandforall,yes or no, in fact, you and your friend
DermTV Syringomas White Hard Bumps Under Your Eyes DermTV Epi 224
Hello, I'm Neal Schultz pause and welcome to DermTV. Today's topic comes from one of Siobhan'sviewers from the YouTube LetzMakeUp channel, that's LETZ MAKEUP. And the question is what are those white hard bumps around the eyeéThey don't act like pimples and they don't respond to treatment like pimples.There's a very good reason they're not pimples. They look like whiteheadsbut they're not. First of
all, they're usually below the eyes, notnext to the eyes or above it, it's usually on the lower lid and they can be whiteor yellow, they can be round or oval and they can be flat topped or sortof dome shaped. They have a special name; they have nothing to do withacne, they're called syringomas and syringomas are really enlargements ofsweat ducts, having nothing to do with oil glands. Let me show you. This isour favorite diagram of the skin and this sweat gland is down here in the middleof the dermis, the middle layer of the skin and when it makes the sweatit has to get the sweat up to
the surface of the skin. So it sends it upthrough this tube which is called a sweat duct and as it comes out ofthe dermis, the middle layer of the skin, it enters the epidermis, the upperlayer of the skin. And when that duct, that tube, going through the epidermisbecomes enlarged, it forms a syringoma. The enlargement of thispart of the duct forms that white, hard, round bump. If you squeeze them,nothing comes out, if you put a pin in them, nothing comes out because they'resolid, they're just enlargements of those tissues and cells thatmake the channel. How do you
treat theseé No creams or skincare productsmake any difference. If you come to a dermatologist's office, each oneindividually has to be operated on, either electrically cauterized or cutout but there's no cream that's going to make a difference. So, if you havethese little, white, round bumps of the lower lid and they bother you,see a dermatologist and he or she can help remove them but no cream is goingto help take care of this one.