PSYB51H3 Study Guide - Rhodopsin

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21 May 2014
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PSYB51 Perception and cognition LEC 5
Newton- Prisms- break up (refract) white light into spectral components
(rainbow)
When he continued and used another prism, you couldn’t do that further,
monochromatic colours- single wavelength
We perceive the continuum of wavelengths as qualitatively different phenomena
Colour isn’t physics its in our minds
How many colour mechanisms are there in your eye 3 cones- 2 perceived
colours, how many colours can you perceive?  millions of colours can be
perceived but you only have 3 mechanisms
Physically the same colour, same colour light, we perceive something that doesn’t
exist in the physical world
Why would the brain create the diff colours colour give us important
information; without colour cues, its hard to detect objects
Univariance –pictures have three layers, red, green and blue
The green filer- lets out green light
The nose and the stars have the same luminance (of the clown face)
Green filter has medium level of luminance filter for the nose, you need these 3
filters because we have three types of cones
One type of photoreceptor cannot make colour discrimination based on
wavelength
M- cone for medium wave lengths at a peak at roughly green light
Green cone output is ambiguous, you cant tell what light the colour the light is
that stimulating the photoreceptor
Rods have to do with scotopic vision, rods have photopigments called rhodopsin
(only photopigment we need to know)
All rods have a tuning function that peaks at 500 nm, its the only photoreceptor
that work, you see things as grey because its the only photoreceptor
Tis is
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