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  • have you ever considered how your eye scans across the landscape?

  • I think most people assume that, like a video camera, it pans smoothly across the scene.

  • But I don't actually think that's what happens.

  • In truth, I think the I jumps from image to image as it moves across this scene.

  • So I'm gonna try to find a volunteer to help me demonstrate that what I'd like you to do is scan across this landscape as smoothly as you can.

  • You try that.

  • Tell me about the process of scanning across.

  • You know, from the point just feels like you're stop it and go in on, like, stop in and go in.

  • And yeah, it's just like this.

  • Like there's a pause all the time, constantly when you going across.

  • It's not like you're just looking straight crafts.

  • It's not smooth.

  • The eye is capable of tracking smoothly.

  • However, if something moves across your field of view, your I can lock onto it and move smoothly with it.

  • What I like to do is I'd like to repeat that little game, but I would like to ask you just to walk across on those rocks and then I'd like you to Just, like, follow her along with your eyes.

  • Is that possible?

  • Okay, let's give it a shot.

  • You wanna go over there?

  • Okay.

  • All right.

  • Go yet.

  • Go for it.

  • Can I just get your reaction on what that was like?

  • How is that the same?

  • We're different.

  • Felt a lot smoother because I was following something.

  • Sort of just looking at something.

  • Yeah.

  • You know, just like if you follow something, you're just your brain focuses on that one thing, and you just kind of just go with it.

  • Why would that be useful To be able to pan with a moving object?

  • How does that affect our perception of motion?

  • Well, I think it makes most motion.

  • Seemed quite smooth and makes it more difficult for us to determine when things are accelerating.

  • One last question since I've got you guys.

  • So what I want to do is I want to drop the ball.

  • I want you guys to watch it and then tell me how the ball moved.

  • Is that fair enough?

  • What?

  • Shit.

  • Till he hits the ground.

  • And then afterwards you gonna tell me how it okay?

  • 32 one, the other just one more.

  • Three, two, one.

  • Could you tell me about the motion of the ball?

  • What was it doing as it went down?

  • It's fast.

  • Um, it just seemed like it just dropped, but it wasn't even moving.

  • You just seen the ball.

  • The ball.

  • That was that.

  • You didn't see it like here.

  • You just saw it from there to there.

  • What would you say?

  • It's speed was constant.

  • Or do you think it's speed was changing?

  • Constant?

  • Yeah, it was the same.

  • Yeah, the whole way down.

  • No acceleration.

  • The goal of my whole experiment today I'll let you guys in on a secret is to point out that the eye tracks motion very smoothly.

  • So when the bowl like goes down, is really easy for us to track that, and it looks like it's just doing one constant thing.

  • But in fact, it is speeding up the whole time.

  • When I release it, it's not moving at all.

  • And when it hits the ground, it's actually going quite fast.

  • So that was kind of my point.

  • If you scan across like a stationary scene, then your eyes doing this weird, jumpy thing.

  • Yeah, but then if you're actually moving with an object or a person or something.

  • When your eyes are so smooth, you don't even notice.

  • Yeah, but something that still and you have to move.

  • That's when it starts a job.

  • It's much easier.

  • Yeah, it's excellent.

have you ever considered how your eye scans across the landscape?

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