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Psych 2115 oct 9.docx

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Psychology 2115A/B

Psych 2115 Lecture October 9 With complimentary colours- you can never produce a different colour by mixing these two (complimentary colours cannot be mixed to produce a third colour, you just get a gradual change over from one to the next) Helmholtz was working with a guy named Maxwell, and he discovered the fact that if you take red blue and green and you mix them in the appropriate fashion you can make any colour you want. He used this knowledge to claim these were the primary colours. This will work as long as the colours are far enough apart- (2)- want to try and make the center of the circle in the triangle. Any set of colours can be primary colours if you wish to use them as such. The trichromatic theory: look this up Maybe you just have receptors in your eyes that are more sensitive to these "primary colours" There are 3 different types of cones- one that is most sensitive to about 420nm (blue), one most sensitive to 530nm (green), and one most sensitive to 560nm (not red, red is up in the 600's) Sufficiently apart on the colour wheel It’s the response of these 3 cones that produce the final perception The trichromatic theory explains colour blindness Found the various types of colour blindness in the world- it was very hard to find people missing the short cone (the blue one)- the largest wavelength is the one that is most common (the orangey wavelength) (after break, check email for part before this) The opponent process theory: Herring. What herring came up ith was the idea that there are certain colours in the world that are complementary and they act complimentary in the sense that you don't see mixtures of them (ie. red and green). Processors that respond one way to red and one way to green, but can't respond to both. Blue and yellow work as well. Herring felt this was the way this worked, not the way Helmholtz suggested with the trichromatic theory. People all over the world come up with 4 general categories of colours: red green blue and yellow. Put up a red stimulus, have a child (as young as 1-2 months) look at it until they get "bored" and habituate, put up a slightly different colour of red and they're still not interested, but put blue up and they're interested. They are categorizing into these 4 colours as well (red green blue and yellow). You see the opponent colour emerge as an after image when looking at a white page (stare at a red colour and your
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