For your brain, after sharing

The images are black and white, but save something unique. If we see a woman stretcher rotating to the right then our right brain is more dominant, while if she was spinning to the left then we are left brain dominant.

Until now, I can not prove it. Because some of my friends watch it spin to the right and no one saw spinning to the left. After I share it on facebook, i got a lengthy discussion 

Adi : I can see to the left and to the right 

Wira : Oh, I can sometimes be. Maybe when we really noticed
Adi : See pictures going around to the right, after that moment close your eyes, look again been going around to the left. Hahahh ..
Wira : Oh yeah, after I see it, sometimes work sometimes not
Adi : Focus only to the foot of the rivet, if the right foot rested imagine he going around to the left, if left foot rested imagine him going around to the right
Wira : Heheh, I got headche now. But how can it work? Image formats .gif that works
Ananta : How is this possible?

After I read this conversation, I think this picture was amazing....