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Foone's profile
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@Foone

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foone

@Foone

Hardware / software necromancer, collector of Weird Stuff, maker of Death Generators. (they/them) Patreon: http://patreon.com/foone  ko-fi: http://ko-fi.com/fooneturing 

Milpitas, CA
floppy.foone.org
Joined February 2008

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    foone‏ @Foone 3 Jul 2018

    You want to know something about how bullshit insane our brains are? OK, so there's a physical problem with our eyes: We move them in short fast bursts called "saccades", right? very quick, synchronized movements. The only problem is: they go all blurry and useless during this

    2:59 PM - 3 Jul 2018
    • 27,110 Retweets
    • 70,334 Likes
    • Fright Fattoum Nasser yeah 🅽🅸🅲🅾🅻🅴 🅼🅸🅻🅻🅴🆁 👙 gross! Јован Maestro Sye dinza
    705 replies 27,110 retweets 70,334 likes
      1. New conversation
      2. foone‏ @Foone 3 Jul 2018

        having your vision turn into a blurry mess every time you move your eyes is obviously not a good idea, so our brains hide it from us. Now, imagine you're an engineer and you have this problem.

        14 replies 216 retweets 3,952 likes
        Show this thread
      3. foone‏ @Foone 3 Jul 2018

        You've got some obvious solutions you could do. 1. make the vision go black during movement. (Some VR games do this!) 2. just keep showing the last thing we saw prior to movement

        10 replies 156 retweets 3,450 likes
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      4. foone‏ @Foone 3 Jul 2018

        both are good options with different downsides, but OH NO. this is assuming everything makes sense and is chronological and (regular) logical. Your brain does neither of these options, really.

        1 reply 134 retweets 3,293 likes
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      5. foone‏ @Foone 3 Jul 2018

        first, it basically puts your visual system on "pause". You're not seeing blackness or even nothing, you're just not seeing period. then when you finish your saccade, it shows you what you now see at the new position. and then it pretends it can time travel.

        16 replies 257 retweets 4,177 likes
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      6. foone‏ @Foone 3 Jul 2018

        it seriously shows you the image at the new point, but time-shifts it backwards so that it seems like you were seeing it the whole time your eyes were moving. And because your brain is not a computer with a consistent clock, this shit works.

        16 replies 331 retweets 5,476 likes
        Show this thread
      7. foone‏ @Foone 3 Jul 2018

        you can see this effect happen if you watch an analog clock with a second hand. Look away (with just your eyes, not your head), then look back to the second hand. It'll seem like it takes longer than a second to move, then resumes moving as normal.

        104 replies 822 retweets 8,407 likes
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      8. foone‏ @Foone 3 Jul 2018

        that's because your freaking visual system just lied to you about HOW LONG TIME IS in order to cover up the physical limitations of those chemical camera orbs you have on the front of your face.

        30 replies 737 retweets 10,165 likes
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      9. foone‏ @Foone 3 Jul 2018

        we've known about this effect for over 100 years, it's called "Saccadic masking" and more specifically Chronostasis. Your visual system lies to you about WHEN things happen by up to half a second(!) just to avoid saccades blurring everything.

        26 replies 426 retweets 6,076 likes
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      10. foone‏ @Foone 3 Jul 2018

        So while I firmly believe we're basically just overgrown biological computers, we're apparently computers programmed by batshit insane drunkards in Visual Basic 5.

        62 replies 1,517 retweets 11,066 likes
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      11. foone‏ @Foone 3 Jul 2018

        and you might think "hey wait, wouldn't my vision 'pausing' for half a second have all kinds of weird effects on moving objects? why don't they appear to stutter when moving?" and the answer is simple! your brain has EVEN MORE UGLY HACKS on top of this to avoid you seeing that

        16 replies 205 retweets 4,367 likes
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      12. foone‏ @Foone 3 Jul 2018

        if you've got a clock where the second hand doesn't "tick" but instead smoothly rotates, you won't see this. Because your brain recognizes it's moving and adjusts what you see to make sure it sees the "right" thing.

        6 replies 128 retweets 3,234 likes
        Show this thread
      13. foone‏ @Foone 3 Jul 2018

        it's only really obvious with periodically moving things like a clock hand, because it's not moving (so not triggering the movement-during-chronostatis hack) but it moves at a set rate, so you can notice that rate appearing to change.

        6 replies 99 retweets 2,770 likes
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      14. foone‏ @Foone 3 Jul 2018

        It's tempting to think of your eyes and visual system as a camera just dumping a video feed into your conscious brain but that's so very, very not the case. What you think you see and what your eyes can actually see are two exceptionally different things.

        13 replies 461 retweets 4,332 likes
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      15. foone‏ @Foone 3 Jul 2018

        The big obvious one being the blind spot. Vertebrate eyes are wired backwards so we've got a blind spot in each eye were the nerves enter into the eye. About 6 degrees of your vision in each eye is just not there, as there's no light sensitive cells there.

        5 replies 148 retweets 2,814 likes
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      16. 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.

        20 replies 206 retweets 3,415 likes
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      17. 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 102 retweets 2,331 likes
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      18. 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.

        11 replies 98 retweets 2,341 likes
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      19. 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

        19 replies 200 retweets 3,563 likes
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      20. 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 91 retweets 2,340 likes
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      21. 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!

        16 replies 140 retweets 3,422 likes
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      22. 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.

        10 replies 322 retweets 4,174 likes
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      23. 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.

        29 replies 275 retweets 3,921 likes
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      24. 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!

        7 replies 78 retweets 2,506 likes
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      25. 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 121 retweets 2,590 likes
        Show this thread
      26. 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.

        23 replies 600 retweets 5,136 likes
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      27. 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 199 retweets 3,198 likes
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      28. 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

        75 replies 1,964 retweets 8,405 likes
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      29. 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 169 retweets 2,556 likes
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      30. 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.

        7 replies 126 retweets 2,719 likes
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      31. 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 82 retweets 2,201 likes
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      32. Show replies

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