The Illusion of Wagon Wheel Movement: A Closer Look

Go have a look at this effect [flickering]:https://michaelbach.de/ot/mot-wagonWheelCol/index.htmlStart with the Basic Wagon Wheel. Given that all the dots are moving clockwise, why does it give you the perception of it moving counter clock wise? What problem in motion perception is this related to (hint: it is discussed in lecture/textbook). How does adjusting the distance (using the slider at the right) affect your perception of the effect? Why does this happen? Change the pattern to view the one row colored wheel. Why does changing the distance between frames not have the same effect on the coloured row?