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  • Hey vsauce Michael here and today I've got a brand new episode

  • of this Vauce lean back you can click this annotation

  • or the link at the top of the description to start it and then you can just lean back

  • and the autoplay playlist bring the knowledge right to your brain

  • as you already know it doesn't really work on mobile phones yet so we can tell

  • you in a better position to lead back

  • in the meantime let's get Saccadic

  • no not psychotic, saccadic

  • referring to what is known as a saccad the quick movements that are eyeballs make me move from one object to the other

  • As you may remember from a previous lean back some animals like most birds

  • cannot move their eyeballs into the look from one thing to another they have to head really really fast

  • and keep the world from being blurry when their bodies new they have to keep

  • their heads completely stationary

  • but here's the lead things about saccad when our eyes move

  • there's a quick blur between one destination and the other

  • and that blur is completely incomprehensible to our brain

  • so what are visual system does is erase it from our memory

  • and instead replace that little fraction of a second that the eye moved

  • during with the very next thing we see. This leads to a really amazing allusion

  • called the stopped clock allusion you may have noticed this before

  • if you've ever been in a room with the clock with the second game like in a classroom

  • starting your eyes back and forth waiting for class

  • to be out now here is what happens right when you don't your eyes to the clock

  • that very first second that very first movement of the second hand

  • that happens when your eyes reach it seems longer

  • in every other second afterwards look away from the clock

  • and then look and that first second was seen to link

  • as if time itself is stop the reason for that

  • is that you're brain replaces the time it took for your eyes the goal from here

  • to the clock with the image of the first thing you saw which with second-hand

  • and so that little fraction of a second of time is added

  • to link the time it takes second-hand to move what's really mind-blowing about this entire

  • fact as it happens all the time all day

  • as you look around the world from one point to another that little fraction of a second

  • that your eyeball was moving is lost and your brain just replace it with a very next thing

  • you see it might just be a tiny tiny mini time

  • but over the course of an entire day those little fraction in a second

  • add up to almost 40 minutes

  • 40 minutes of everyday that you're awake are lost

  • because of eyeballs move

  • and that's always thanks for watching

  • so what are you waiting for

  • picture to start the leaf back or click the link at the top of this video

Hey vsauce Michael here and today I've got a brand new episode

Subtitles and vocabulary

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A2 BEG US clock fraction lean link brain move


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    Vivian Lam   posted on 2014/07/31
Video vocabulary