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The Ternus illusion, also commonly referred to as the Ternus Effect is an illusion related to human visual perception involving apparent motion. In a simplified explanation of one form of the illusion, two discs, (referred to here as L for left and C for centre) are shown side by side as the first frame in a sequence of three frames. Next a blank frame is presented for a very short, variable duration. In the final frame, two similar discs (C for centre and R for right) are then shown in a shifted position. Depending on various factors including the time intervals between frames as well as spacing and layout, observers perceive either element motion, in which L appears to move to R while C remains stationary or they report experiencing group motion, in which L and C appear to move together

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  • Ternus illusion (en)
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  • The Ternus illusion, also commonly referred to as the Ternus Effect is an illusion related to human visual perception involving apparent motion. In a simplified explanation of one form of the illusion, two discs, (referred to here as L for left and C for centre) are shown side by side as the first frame in a sequence of three frames. Next a blank frame is presented for a very short, variable duration. In the final frame, two similar discs (C for centre and R for right) are then shown in a shifted position. Depending on various factors including the time intervals between frames as well as spacing and layout, observers perceive either element motion, in which L appears to move to R while C remains stationary or they report experiencing group motion, in which L and C appear to move together (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/An_example_of_Group_motion.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/An_example_of_element_motion.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Element_motion_in_a_Ternus_display.gif
  • http://commons.wikimedia.org/wiki/Special:FilePath/Group_motion_in_a_Ternus_display.gif
  • http://commons.wikimedia.org/wiki/Special:FilePath/The_three_frames_of_the_Ternus_illusion.png
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  • The Ternus illusion, also commonly referred to as the Ternus Effect is an illusion related to human visual perception involving apparent motion. In a simplified explanation of one form of the illusion, two discs, (referred to here as L for left and C for centre) are shown side by side as the first frame in a sequence of three frames. Next a blank frame is presented for a very short, variable duration. In the final frame, two similar discs (C for centre and R for right) are then shown in a shifted position. Depending on various factors including the time intervals between frames as well as spacing and layout, observers perceive either element motion, in which L appears to move to R while C remains stationary or they report experiencing group motion, in which L and C appear to move together to C and R. Both element motion and group motion can be observed in animated examples to the right in Figures 1 and 2. (en)
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