Random programming so that she spins & changes direction at random times so there isn't a specific loop timing....but there are random generator that can make things change at random times (computer programmer in my previous life).

I watch & I can see the points of transition between clockwise & counter-clockwise.......randomly it can stay in one direction long enough that's all one sees in the time they are looking at it.

I don't believe that this test proves anything about right or left brained people IMO