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beta movement
The beta movement is an optical illusion, first described by Max Wertheimer in 1912,〔Wertheimer, M. (1912). Experimentelle Studien über das Sehen von Bewegung. Zeitschrift für Psychologie, 61, 161–265.〕 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, so changes about double of this are registered as motion instead of being separate distinct images.
==Examples of use of beta movement==
One example of the beta movement effect would be a set of LEDs, as shown at the picture on the right. The LEDs, electronically, are individually controlled, but our eyes and brains perceive them as a snake running clockwise around the four edges of the square picture. This is also seen commonly on LED displays.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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