Color Vision and Color Matching, Slides of Brain and Cognitive Science

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Retina Color

Color Matching Experiment

I(λ 1 )+ I(λ 2 ) + I(λ 3 ) I(λ)

Midget ganglion cells (P cells)

Small bistratified ganglion cells (K cells)

Parasol ganglion cells (M cells)

L and M

cones

Rods

L and M

cones

S cones

P cells (midget) M cells (diffuse)

K

cells

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Trichromacy

Let n 1 ( ) l , n 2 ( ) l ,and n 3 ( ) l be three spectral

distributions (primaries) such that ( R G 1 , 1 , B 1 ),

( R 2^ ,^ G 2^ , B 2^ )and^ ( R 3^ ,^ G 3^ , B 3^ )are linearly independent.

Then, for any arbitrary spectral distribution, n ( ) l ,

there always exist three constants, c 1 (^) , c and c 2 3 ,

such that

n º c n 1 1 (^) + c n 2 2 (^) + c n 3 3

These three constants are obtained by solving the three equations:

R º c R 1 1 (^) + c R 2 2 (^) + c R 3 3

G º c G 1 1 (^) + c G 2 2 (^) + c G 3 3

B º c B 1 1 (^) + c B 2 2 (^) + c B 3 3

Standard Deviation of Receptor Response Difference

S = squirrel monkey F = frog G = grey squirrel T = tree shrew

Regan et al. (2001)