Figure 8.8: What do you see? The first image (A) serves as a control. Everyone should see the number “12.” For the second image, people with normal color vision will see the number “26.” People with color blindness (mostly males) will see only the “2,” only the “6,” or (like one of the book’s authors) no numbers at all.
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Garo/Phanie/Science Source
Garo/Phanie/Science Source