If you’ve ever tried riding a provincial bus, you could be familiar with the feeling—so you’re there, comfortably seated inside your bus (sandwiched by other buses), waiting for departure time when you suddenly see from your periphery that you’re already moving only to realize you aren’t and that the bus next to yours just nudged. You perceived movement that wasn’t happening and even your body felt like it got transposed when it wasn’t.
No need to get an eye checkup because it isn’t just your vision but your perception: specifically, your proprioception.
As shown in the video and as with what we said about how illusions are mostly because of perception, our cognition, more than our vision, affects our perception which in turn affects our bodies. True, the models in the video might have “seen” the vertical lines move but their proprioception or ability to make a mental map of their own bodies, registered this movement differently, ie it’s the ground that’s moving and not the walls. That’s because were more used to being displaced rather than have the environment around us do the displacing.
So yeah, vision might play a big part in maintaining our balance but how we perceive the world makes a bigger impact on whether we stand strong of fall hard.
If a person who is legally blind if not for high-grade glasses were to take the balance experiment, do you think the same results will happen to him?