The beta movement is an optical illusion, first described by Max Wertheimer in 1912, whereby a series of static images on a screen creates the illusion of a smoothly flowing scene. This occurs when the frame rate is greater than 10 to 12 separate images per second. It might be considered similar to the effects of animation. The static images do not physically change but give the appearance of motion because of being rapidly changed faster than the eye can see.
This optical illusion is caused by the fact that the human optic nerve responds to changes in light at about 10 cycles per second,[citation needed] so changes about double of this are registered as motion instead of being separate distinct images.
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