If it takes a large amount of yellow, then the original color is said to produce a large blue chromatic response. Transparency of Fig. 10.4C Neural connections Brain often processes by looking at differences between two signals. The combined signal produces a chromatic channel . In S cones inhibits response.
Negative signal implies perception of blue.
This is how the violet end of the spectrum appears to have red in it. So four fundamental hue responses. Transparency of Fig. Now we can point out where the various signals are positive and negative. Transparency of Fig.