Color Vision Theories by Meredith Hollinger https://padlet.com/meredithhollinger/hyypdyiywsso en-us 2016-10-25 15:08:02 UTC 2016-10-25 15:36:21 UTC hello@padlet.com Opponent Process Theory  meredithhollinger https://padlet.com/meredithhollinger/hyypdyiywsso/wish/133038945 - This theory states that the cone photo-receptors are linked together to form three opposing color pairs. These color pairs are: blue/yellow, red/green, and black/white.  The activation of one member of the pair causes the inactivity in the other.

- Picture example

- A test for the theory would be:

  • Take a small square of white paper and place it at the center of a larger red square.
  • Look at the center of the white square for approximately 30 seconds, and then immediately look at a plain sheet of white paper and blink to see the afterimage.
  • What color is the afterimage? You can repeat this experiment using green, yellow, and blue.

- Strengths of the theory: 
Processing is strengthened

  Weaknesses: 
       Not being able to take in both colors at the same time 
       
]]> 2016-10-25 15:09:36 UTC https://padlet.com/meredithhollinger/hyypdyiywsso/wish/133038945 Trichromatic Theory zarahfowler https://padlet.com/meredithhollinger/hyypdyiywsso/wish/133039221 Based on the idea that there are 3 different cone receptors, this means that 3 cones perceive all the colors. The cones perceive red, yellow, and blue
Evidence for the theory comes from color matching and color mixing studies. Young and Helmholtz carried out experiments in which individuals adjusted the relative intensity of 1,2, or 3 light sources of different wavelengths so that the resulting mixture field matched an adjacent test field composed of a single wavelength.  Individuals with normal color vision needed three different wavelengths (i.e., primaries) to match any other wavelength in the visible spectrum. 
strengths- It explains how there can be many different types of color blindness.
weaknesses- It doesn't explain other color phenomenon though. Like complementary afterimages. ]]> 2016-10-25 15:10:13 UTC https://padlet.com/meredithhollinger/hyypdyiywsso/wish/133039221 zarahfowler https://padlet.com/meredithhollinger/hyypdyiywsso/wish/133043723
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