New Scientist has a discussion on the spinning dancing girl and says that "What this animation does not involve is different sides of the brain, as the initial post claims. What you see is purely due to your perceptual and cognitive flexibility."
I am not so sure. Reversal rates seem to vary and some can see only clockwise or anticlockwise motion.
This Wikipedia artcle says:
"Reversal rates vary drastically between stimuli and observers, and has been found to be slower for people with Bipolar disorder ("sticky" interhemispheric switch in bipolar disorder)".
Combining motion and sound has interesting effects like the McGurk Effect.
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