I found this on another forum.
Look at the following woman before you proceed to the questions:
Do you see her turning clockwise or counterclockwise?
Can you see both directions?
If you see her turning clockwise, your right brain dominates.
If you see her turning counterclockwise, your left brain dominates.
If you can see her turning both ways, you are likely to have a high IQ.
Let's see how different types of people respond to this test.
I saw her turning clockwise and I could see the other direction when I really tried to see it, but not immediately.