Color Vision

Question 1

spectroradiometry

Answer 1

the measurement of optical radiant energy at each wavelength

Question 2

radiometry

Answer 2

measurement of optical radiant energy

Question 3

hue

Answer 3

the perceptual pigmentation difference experience with varying wavelengths ex: blue, green, etc.

Question 4

brightness

Answer 4

the intensity of the hue, varies in relation to amplitude of the light

Question 5

saturation

Answer 5

degree of white light mixed in with the dominant wavelength - perceptually experienced as the purity of the color

Question 6

pure light

Answer 6

light which can be experienced as only one hue - light of a single wavelength

Question 7

composite light

Answer 7

light comprised of many different wavelengths

Question 8

spectral colors

Answer 8

Red to blue

Question 9

non-spectral colors

Answer 9

combination of short and long ends of spectrum - purple, magenta, pink

Question 10

color discrimination/wavelength discrimination

Answer 10

where the slopes of the cone absorption spectra change most rapidly with respect to each other

Question 11

perception of saturation

Answer 11

wavelength dependent - least saturated at monochromatic stimulus of 570 nm

Question 12

colorimetric purity

Answer 12

a physical property of a stimulus equal to:

luminance of the monochromatic light)/(sum of luminance of monochromatic light and luminance of white light added

Question 13

monochromatic stimulus

Answer 13

no white light added to it. colorimetric purity of 1

Question 14

Bezold-Brucke shift

Answer 14

monochromatic stimuli slightly change hue as their intensity is adjusted

Question 15

unique hues

Answer 15

hue doesn’t change with intensity change - blue (478), green (503), and yellow (578)

Question 16

color constancy

Answer 16

approximately constant color appearance of objects as light conditions change

Question 17

munsell color appearance

Answer 17

describe colors with 3 physical dimensions: hue, chroma, and value
conceptualized as a cylinder containing various color samples

Question 18

chroma

Answer 18

colorimetric purity and saturation of the color sample

Question 19

value

Answer 19

reflectance of the sample/brightness

Question 20

primary colors of munsell color appearance system

Answer 20

red, yellow, green, blue, and purple

Question 21

hue measurement of munsell color appearance system

Answer 21

change measured by circumference around cylinder

Question 22

chroma measurement of munsell color appearance system

Answer 22

radius away from cylinder (1-14).

highest purity = 14 (farthest from cylinder)

Question 23

value measurement of munsell color appearance system

Answer 23

height on cylinder (0-10)

least reflectant = 0/most reflectant = 10

Question 24

most direct measurement of the photopigment spectra

Answer 24

electrophysiological recordings of individual photoreceptors and molecular genetics

Question 25

spectral sensitivity

Answer 25

the reciprocal of threshold wavelength function

Question 26

function of wavelength

Answer 26

the amount of energy required to elicit a criterion response in an isolated cone

Question 27

trichromatic theory

Answer 27

PHOTORECEPTOR
color is coded by (3) cones
evidence shown by color matching and color mixing studies

Question 28

s cone

Answer 28

blue

Question 29

m cone

Answer 29

green

Question 30

l cone

Answer 30

red

Question 31

color opponent theory

Answer 31

NEURAL
the photoreceptors are linked together to form three opposing color pairs (black/white, red/green, blue/yellow) activation of one inhibits another - explains complementary afterimage and color deficiency