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Psychology 2115A/B
Stephen Lupker

Lecture: 7 October-17-11 2:23 PM Vision  Mixing light  Draws a circle, with a dot in the middle, its colourless in the circle and then the colours are around the circle  If you draw a straight line between two colours you want to mix, this allows you to predict the colour, so you star the middle of the line  But if you put say 75% more green and 25% orange then you will star the area closer to the green  No matter what you will always be inside the circle, it is not even possible in nature to get a fully saturated colour  Any two colours that are across from each other is called complementary colours  So what happens when you mix these colours  You will end up right in the middle of the circle if you add 50% of each  Which you will then get a gray colour  If say mixed red and green your options to see are red, green or gray you will never get a third colour (blue to yellow= green for example)  If you think about the geometry of the colour wheel  If you take three colours which are sort of well spread it is possible to produce any colour with the appropriate mixes of those colours  This was discovered by Helmholtz, and he was working with this with Maxwell and they came up with this idea that this is only true with red blue and green, and then it was discovered later that you can chose any three colours as long as they are fairly spread out  Helmholtz talks about primary colour which is red blue and green  When you are mixing paints its a lot different That means when you mix paint together you see the light absorbing everything but the actual  colour  You may then get a mucky brown colour instead of a nice colour for instance blue and yellow= brown or green  What's going on in our system that allows us to perceive changes in colours  What is the structural aspects that allow us to do this  Helmholtz (tri-colour theory)  He suggest that our eyes have receptors  Each that are sensitive to certain colour ex. A receptor sensitive to blue  Three cones that are sensitive to 420 (blue) 530 (green) 560 (red) which in theory gives us the whole colour circle  A colour blind person is then someone who has a faulty cone, this then shows that there should be three kinds of colour blind people  560 and 530 did show up but 420 was not shown  About 50 years ago in Britain they put an ad out in the newspaper  And asked people if they have this colour blindness then to come to them and study them  They found 8 people in all of Britain that were 420 colour blindness  Hering  Came up with the Component Processing Theory  He
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