Visual Perception for Fun
Don't I see red and you see blue and we call it green as we told to do? At this time of year I often find myself embroiled in family dinner conversation. In my family someone will bring up, one of the old classics thought puzzles normally in an effort to steer the conversation away from the same old same old - money, religion and morality trench. Last night was no exception and I was delighted again to hear the re-discussion of such a classic puzzle. Do we all see red or do we have a random conditioned - name - allocated to a particular frequency of light - red in this case, irrespective of how it appears to us. The argument normally ends in the typical line - well, it's impossible to know. This morning I thought I would examine the claim for fun. So red (400–484 THz) hits the retina cones, each "tuned" to respond best to light from a portion of the spectrum of visible light (red, green and blue). In this case long-wavelength of light = red. Then it’