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Foone's profile
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@Foone

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foone

@Foone

General hardware / software necromancer. Collector of Weird Stuff. Patreon: https://www.patreon.com/foone 

Milpitas, CA
foone.org
Joined February 2008

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    1. foone‏ @Foone 3 Jul 2018

      do you see a blind spot, right now? no, you probably don't. Close one eye! there's now no way for the other eye to fill in the gaps. Still, no blind spot... Your visual system is lying, and making up content it thinks is there. You literally cannot see what you think you see.

      19 replies 208 retweets 3,368 likes
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    2. foone‏ @Foone 3 Jul 2018

      Here's another one: You can see in color, right? (well, some of you can't. Sorry) You can see in color all throughout your vision, it's color everywhere? Well, most of your cone cells (Which are sensitive to color) are in the fovea, a little spot in the center of your visionpic.twitter.com/Xf7sGgtdtx

      5 replies 101 retweets 2,292 likes
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    3. foone‏ @Foone 3 Jul 2018

      So outside of that center-of-vision spot, you have very little color perception. There's some but it's very limited compared to your main color vision. But I bet if you shift your attention to your peripheral vision right now, it's in color.

      12 replies 95 retweets 2,277 likes
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    4. foone‏ @Foone 3 Jul 2018

      your vision system is lying. it's remembering what colors things are and guessing and filling in the gaps. It's basically doing a Ted Turner colorization process on your non-central vision.pic.twitter.com/3rV3uTZypf

      16 replies 199 retweets 3,478 likes
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    5. foone‏ @Foone 3 Jul 2018

      There's even weird effects like what's called "Action-specific perception". If you get a bunch of white balls of various sizes and toss them at people then ask them to estimate the size of the balls thrown at them, they'll have a certain size estimate, right?

      1 reply 87 retweets 2,285 likes
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    6. foone‏ @Foone 3 Jul 2018

      now repeat the experiment but ask them to try to hit the balls back with a bat, and suddenly all the estimates shift larger. They actually see the ball as bigger because they need to hit it. their vision is exaggerating it to make it easier to see!

      14 replies 131 retweets 3,296 likes
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    7. foone‏ @Foone 3 Jul 2018

      which just goes to show, like I said, your vision is not a camera. perfect accuracy is not one of its goals. it does not give any shits about "objective reality", that's not important.

      11 replies 307 retweets 4,087 likes
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    8. foone‏ @Foone 3 Jul 2018

      what's important to the evolution of the visual system is any trick that helps you survive, no matter how "dumb" or "weird" it is. So if you want an accurate visual representation of what things look like? Use a camera. Not your eyes.

      28 replies 268 retweets 3,840 likes
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    9. foone‏ @Foone 3 Jul 2018

      in any case the original point was that while you might know this about your eyes being poor cameras that lie to you, you might still think that at least they're consistent, time-wise. they don't screw with your sense of time passing, just to make up for visual defects. NOPE!

      6 replies 79 retweets 2,460 likes
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    10. foone‏ @Foone 3 Jul 2018

      if you can't get it done in time, turn back the clock and pretend you did. That's a perfectly good solution when you're the visual system.

      9 replies 117 retweets 2,538 likes
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      foone‏ @Foone 3 Jul 2018

      BTW @hierarchon reminded me of a neat trick with saccadic masking: go look in a hand mirror. no matter how close you bring it to your eyes, and how much you look around, you will never see your eyes move. You're blind during those moments. But you still think you are seeing.

      3:37 PM - 3 Jul 2018
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      22 replies 601 retweets 5,072 likes
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        2. foone‏ @Foone 3 Jul 2018

          she additionally pointed out that your phone's selfie-mode is NOT a mirror, and it has a slight delay, so you can see your eyes moving in it.

          7 replies 198 retweets 3,148 likes
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        3. foone‏ @Foone 3 Jul 2018

          And for fun, here's wikipedia's example of the blindspot. Stare at L with only your left eye, adjust the distance, and the R will disappear. You don't see "nothing" or "black", you see the background, because you expect to.pic.twitter.com/NBN485EOvC

          81 replies 2,034 retweets 8,404 likes
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        4. foone‏ @Foone 3 Jul 2018

          This is why laser damage your retina can be so insidious. Your visual system already can hide "holes" in your vision, what's one more to hide? So you damage a small spot of your retina and your visual system covers it up.

          13 replies 144 retweets 2,422 likes
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        5. foone‏ @Foone 3 Jul 2018

          but since you didn't go "WELL THAT WAS TERRIBLE I BETTER TAKE BETTER CARE OF MY EYES" and stop fucking with lasers, you keep doing it eventually you accumulate so much damage that your visual system simply cannot manage hiding it all and your vision rapidly degrades.

          8 replies 114 retweets 2,586 likes
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        6. foone‏ @Foone 3 Jul 2018

          the other reason lasers are so dangerous is that they don't necessarily trigger the same responses as regular incoherent light. your pupil reflex is only triggered by some special cells in the center of your eye, so an off-center laser might not cause your iris to contract

          8 replies 79 retweets 2,143 likes
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        7. foone‏ @Foone 3 Jul 2018

          and infrared laser light is just as dangerous as visible laser light, but can't trigger your blink reflex. Your eyes automatically close when exposed to bright light, but they can't detect infrared light. Despite not seeing it, it still causes damage.

          5 replies 76 retweets 1,659 likes
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        8. foone‏ @Foone 3 Jul 2018

          Anyway, back on how amazing and crazy your vision is: There was an experiment back in 1890 where someone wore glasses made with mirrors in them to flip their vision. After about 8 days, they could see just fine with them on. Their vision system had started "flipping" the image.

          18 replies 164 retweets 2,436 likes
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        9. foone‏ @Foone 3 Jul 2018

          (I say flipping in quotes because it's not as simple as it started showing the pixels at the top row on the bottom row, cause our vision doesn't work like that) It only took them a few hours to get back to normal after taking these glasses off, though.

          5 replies 56 retweets 1,680 likes
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        10. foone‏ @Foone 3 Jul 2018

          The last really fun part about this flipping experiment: your eyes already do it. Based on how our vision is wired, we should be seeing everything upside down. We don't, but only because our visual system has had our whole life to adapt to this.

          26 replies 71 retweets 1,923 likes
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        11. foone‏ @Foone 3 Jul 2018

          BTW, since a few people have brought it up: There's a great sci-fi novel by Peter Watts called Blindsight. In it humans encounter an alien race they call Scramblers, who can move very fast and precisely, and they exploit saccades.

          45 replies 249 retweets 3,612 likes
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        12. foone‏ @Foone 3 Jul 2018

          because if they only move during saccades, we never see them moving. and since so much of our vision is based on just filling in what we think is there, if they stay out of the direct center of our vision, we'll just visually fill them in, like they were never there.

          17 replies 80 retweets 2,190 likes
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        13. foone‏ @Foone 3 Jul 2018

          Check it out if you're into hard SF stories of first contact. It's got some really neat ideas about human vision, very unique aliens, the nature of conciousness, the future of humanity in the face of perfect VR, and vampires. (Really, it has "vampires", while still being hard-SF)

          18 replies 59 retweets 2,188 likes
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        14. foone‏ @Foone 3 Jul 2018

          BTW, remember how I said "vertebrate eyes" up there? Guess who has eyes which are wired forwards instead of backwards (no have no blindspot), have an internal lens, and can even see polarization of light? our good friends the Cephalopods!pic.twitter.com/SOMT5CB2SY

          146 replies 235 retweets 3,270 likes
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        15. End of conversation
        1. Bicho Raro‏ @LorettaPFJ 3 Jul 2018
          Replying to @Foone @hierarchon

          Which makes me wonder how on Earth could comedian Marujita Díaz practice her "moving eyes" gagpic.twitter.com/sol2TkJHX0

          0 replies 2 retweets 2 likes
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        1. Kelly Fowler  🦋 🌊‏ @kellyfirehorse 5 Jul 2018
          Replying to @Foone @hierarchon

          What are you doing to me!!!! 😱pic.twitter.com/rb5dwF8HID

          0 replies 0 retweets 2 likes
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        1. Dawn R‏ @Boneist 4 Jul 2018
          Replying to @Foone @hierarchon

          So that’s why I can’t see my eyes wobbling in the mirror. (I have nystagmus, which causes my eyes to wobble.) I just checked + I can see them wobble via my phone’s front camera 👍 I took this video whilst also looking in a mirror; my eye appeared still in the mirror. Weird!pic.twitter.com/H1sOISmhlf

          0 replies 0 retweets 2 likes
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        1. Mike Venture‏ @mikeventureDIY 4 Jul 2018
          Replying to @Foone @hierarchon

          How could you see your eyes move in any case? You need to be looking at your eyes in the mirror to see your eyes; when you move your eyes you can't see your eyes until they're pointed at your eyes, ie finished moving

          0 replies 0 retweets 1 like
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        1. TexasYeti63‏ @TexasYeti63 3 Jul 2018
          Replying to @Foone @hierarchon

          Weird, if you move your eyes, nothing, but if you turn your head and look straight they move around nice and smooth. The muscles still have to move your eyes to keep them focused on the same spot...

          0 replies 0 retweets 1 like
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        2. cyberbeard 2077‏ @beardalaxy 3 Jul 2018
          Replying to @Foone @hierarchon

          Fun addition to this that if you can make one of your eyes move independently of the other you can see it move in a mirror hahaha. I actually learned how to do that trying to see my eyes move in a mirror.

          1 reply 0 retweets 0 likes
        3. Arquinsiel Teknogrot‏ @Teknogrot 4 Jul 2018
          Replying to @beardalaxy @Foone @hierarchon

          My left eye turned in as a kid, but after corrective surgery I learned how to do it on command. When hearing about this first I tested it that way. Cool as hell innit?

          0 replies 0 retweets 1 like
        4. End of conversation

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