a nice illusion showing eye movements in action
By user12820842 on Apr 19, 2005
so the other day i was talking about eye movements and how visual processing is non-uniform across the visual field. it's hard to see these in action without investing in some expensive equipment, or without staring at someone else's eyes for a long time. so to save on romantic misunderstandings, check out the following demo, or this one's even more infuriating. what you notice is the grey dots at the intersections appear and disappear the whole time. what's going on? you can read about why here too, but for our purposes the demo shows two things. first, your eyes really are moving the whole time (unless you make a concerted effort not to move them of course. even then, there's a slight jitter, due to an imbalance in the antagonistic muscles controlling the eye), since the dots and dot-free zone keep shifting, and second that processing in central vision is different, since no dots appear where you're looking directly.