In 1872 German physiologist Ewald Hering suggested that color vision was based on opponency between red and green and between yellow and blue; at each spot in the visual field, the redness and ...

In a separate experiment, the researchers found that this color-opponency system did not work for memories. They presented the same participants with pictures of objects that a color is commonly ...

The result is a color signal that travels back to the brain ... The diagram revealed different patterns for the red /green opponency and the yellow/blue opponency, and provided new information ...