Twitter | Search | |
foone
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
Reply Retweet Like More
foone Jul 3
Replying to @Foone
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.
Reply Retweet Like
foone Jul 3
Replying to @Foone
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
Reply Retweet Like
foone Jul 3
Replying to @Foone
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.
Reply Retweet Like
foone Jul 3
Replying to @Foone
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.
Reply Retweet Like
foone Jul 3
Replying to @Foone
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.
Reply Retweet Like
foone Jul 3
Replying to @Foone
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.
Reply Retweet Like
foone Jul 3
Replying to @Foone
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.
Reply Retweet Like
foone Jul 3
Replying to @Foone
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.
Reply Retweet Like
Atom Werewolf Jul 3
Replying to @Foone
Did you see the amazing VR trick where they move stuff during your saccades to make you walk in circles so a small room feels infinitely big?
Reply Retweet Like
foone Jul 3
Replying to @Foone
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.
Reply Retweet Like
Atom Werewolf Jul 3
Replying to @Foone
Reply Retweet Like
foone Jul 3
Replying to @Foone
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
Reply Retweet Like
foone Jul 3
Replying to @Foone
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.
Reply Retweet Like
foone Jul 3
Replying to @Foone
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.
Reply Retweet Like
foone Jul 3
Replying to @Foone
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.
Reply Retweet Like
Generální úřad pro tmu Jul 3
Replying to @Foone
So we're, like, watching a slideshow of reality with a lot of what we suppose happens between the frames that actually get delivered to us? That's neat. Or incredibly ugly.
Reply Retweet Like
foone Jul 3
Replying to @Foone
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.
Reply Retweet Like
foone Jul 3
Replying to @Foone
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.
Reply Retweet Like
annihilator 🏳️‍🌈 Jul 3
Replying to @Foone
Here's a fun related experiment I just tried. If I get real close to a mirror and look back and forth between my eyes, I don't see my eyes move because of masking. But I *can* see my eyes move if I use my phone's front camera as a mirror because there's a delay!
Reply Retweet Like