How does the brain work is still one of most intriguing unresolved mysteries of science. Here is one practical test that will show you just how amazing and hard it is to evaluate how does the brain work.
You need to look at the animation and tell if you see the dancer turning clockwise or anti-clockwise. You may think that it is clear that is is turning only way way. It turns out that different people have different perception of what is really happening. If you see it turn clockwise, then you use more of the right side of the brain and vice versa.
You can also try to concentrate and try to turn the dancer other way around just by using your brain!

LEFT BRAIN FUNCTIONS
uses logic
detail oriented
facts rule
words and language
present and past
math and science
can comprehend
knowing
acknowledges
order/pattern perception
knows object name
reality based
forms strategies
practical
safe
RIGHT BRAIN FUNCTIONS
uses feeling
"big picture" oriented
imagination rules
symbols and images
present and future
philosophy & religion
can "get it" (i.e. meaning)
believes
appreciates
spatial perception
knows object function
fantasy based
presents possibilities
impetuous
risk taking
Original article here
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39 Comments
she is turning in both directions.everyone can see that dah
this lady is moving in the clockwise direction at first for about 2 mins and then changes and moves in the clockwise diretion
If you could have only predicted the traffic you would get with the twirling girl?
it's turning anti-clockwise! can't anybody see it?
it is so dynamic and unpredictable... and its such a cheat of a dancer.
its so clockwise you don't even have to think about it....
the lady turns clokwise and the after a wile she changes her direction just watch for a wile and you will see
you dont use your brain at all she turns by herself
OK! I see it both ways. That is because the lady is not even turning a full 360 degree turn. She is just moving her one leg 180 degrees and back. Only her head and her upper body is doing a full 360 degree turn. You can see it both ways if you concentrate.
I seem to think the actual dancer changes direction of her movements rather than our perception changing...
counter clockwise baby!. left brain for the war.
I can see it going both directions at the same time. My eyes start to feel weird and then I see it, just 1 image of it, but one side of my mind perceives all the attributes of it as leftward going, and the other side perceives all attributes of it as rightward going, and I'm behind there going good job you're both right. It's the same as seeing vases and faces simultaneously or seeing multiple possibilities at once in a chess game, for example.
WOW i first saw it clockwise, then looked away but had a blurry image of it [still looking] then made it go anti clockwise! then slowly looked at the image and was going anti clockwise for 20 seconds AWESO!M!!!
Going clockwise for me there you go!