doug65oh @ Mon Sep 17, 2007 12:55 am wrote:... The effect the visual stimulus has on the brain aids or hinders how we perceive it....
I agree, Doug.
The image of the dancer is an optical illusion. Our brains are basically "tricking" us into seeing the dancer change direction from clockwise to counter-clockwise and vice versa. In other words, we don't always see what we think we see. I'll make an attempt at illustrating what I believe is happening. Click on the image to show the wheel turning.
Focus on the red dots, and follow them around the wheel - the wheel will appear to be rotating in a counter-clockwise direction. Then switch your focus and follow the yellow dots around the wheel - it now appears to be rotating in a clockwise direction.
The same thing happens when you focus on the dancer. If your focus is
disrupted, then the
effect of the disruption causes the image to appear as if it has changed direction. That is why all of the different ways we have discovered to get her to move in the opposite direction, work. I can even get her to change direction simply by blinking my eyes, once, after focusing on the image for about 30 seconds or so.
The difference between the dancer and the turning wheel is that the dancer is a more complicated creation of an optical illusion than the image of the turning wheel.
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