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The spinning dancer is a kinetic, bistable optical illusion resembling a rotating female dancer. The Spinning Dancer, also known as the Silhouette Illusion, is a kinetic, bistable, animated optical illusion originally distributed as a GIF animation showing a silhouette of a pirouetting female dancer.
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The spinning dancer appears to be moving clockwise or counterclockwise depending on spontaneous activity in the brain where perception is subjective. Recent studies show on the fMRI that there are spontaneous fluctuations in cortical activity while watching this illusion, particularly the parietal lobe because it is involved in perceiving movement.
To learn more about this difference, brain activation during a mental rotation task was studied. In 2012, a study [26] was done in which males and females were asked to execute a mental rotation task, and their brain activity was recorded with an fMRI. The researchers found a difference of brain activation: males presented a stronger activity ...
The afterimage is a consequence of neural adaptation of the cells that carry signals from the retina of the eye to the rest of the brain, the retinal ganglion cells. [7] According to opponent process theory, the human visual system interprets color information by processing signals from the retinal ganglion cells in three opponent channels: red ...
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This goes to show just how powerful the illusion is. She is not "spinning" in any direction, nor is her shadow. She is a black 2-dimensional collection of pixels, constantly changing shape. Because your mind perceives this shape as a familiar 3-dimensional object - a woman rotating-, your brain wants to assign a rotation to it.
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