For as long as I can remember movements in my far peripheral vision have really irritated me. For instance, if someone spins something and I can see it right at the edge of my vision it will annoy the hell out of me. I'll find it quite hard to concentrate on what I was previously doing because my attention will be focused on that movement, almost as if I'm a predator seeking prey.
I seem to notice small movements like this more than others around me. If I'm sitting in a classroom and a light flickers slightly in the corner I will detect that instantly, whereas quite often after a few minutes of the light flickering someone will go: "Hrm, that light is flickering" (or something to that effect) and people will turn as if they hadn't seen it before. However, it may just be that they're more interested with communicating with each other so have that as a distraction.
It's not that I have poor concentration; I can concentrate for hours without a break. It's just that my brain seems particularly tuned into these signals, whereas apparently blatantly obvious things like a man walking past with a duck on his head, I don't notice.
Anyway, I was wondering if anyone else experiences this.