The Fraser-Wilcox illusion, figure (stimulus) consists of several concentrically
The Fraser-Wilcox illusion, figure (stimulus) consists of several concentrically arranged rings. The color of each pixel of the rings was originally created by Taninaka based on the figure presented by Kitaoka. As shown in the figure below, the RGB pixel values are a function of the direction in which the pixel is viewed from the center of the ring and its angle. the R component is bright over 360 degrees and never reaches 0 at any angle, so the ring is entirely reddish. the B component has bright and dark areas at different angles. the G component is 0 over 360 degrees. Since the R and B waveforms are out of phase, if there is a difference in the response speed of the R and B cones, one will be perceived first and the other later, resulting in apparent motion and rotation.
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The Fraser-Wilcox illusion
,
figure (stimulus) consists of several concentrically arranged rings
.
The color of each pixel of the rings was originally created by Taninaka based on the figure presented by Kitaoka
.
As shown in the figure below
,
the RGB pixel values are a function of the direction in which the pixel is viewed from the center of the ring and its angle
.
the R component is bright over 360 degrees and never reaches 0 at any angle
,
so the ring is entirely reddish
.
the B component has bright and dark areas at different angles
.
the G component is 0 over 360 degrees
.
Since the R and B waveforms are out of phase
,
if there is a difference in the response speed of the R and B cones
,
one will be perceived first and the other later
,
resulting in apparent motion and rotation
.
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