The colored dot/peripheral vs. central vision

You will see that the spots move along straight horizontal paths. But now look at it in peripheral vision – look away, but attend to the movie out of the corner of your eye. The paths of the spots now appear to be bent, in the direction of the background stripes. In this example, the spots move around in a circle. But in peripheral vision they appear to slide vertically when the background stripes are vertical, and horizontally when the stripes are horizontal.