Chapter 9

Question 1

What is cerebral achromatopsia?

Answer 1

A type of colourblindness cuz of cerebral cortex of the brain

Ventro- medial occipital and temporal lobes

Question 2

What is colour deficiency / congenital achromatopisa ?

Answer 2

At birth lack of colours

Question 3

Name the colours for these wavelengths:

400-450

450-490

500-575

575-599

590-620

620-700

Answer 3

400-450 - Violet

450-490 - Blue

500-575 - Green

575-599 - Yellow

590-620 - Orange

620-700 - Red

Question 4

What is the visible spectrum in between ?

Answer 4

Infrared and Uv

Question 5

What is selective transmission?

Answer 5

How we see colours

Specific wavelengths are reflected to the eyes and the rest are absorbed

Question 6

Is mixing paints additive or subtractive?

Answer 6

Subtractive!

When mixing paints only colour that stays is the one both somewhat reflected

Question 7

Is mixing lights additive or subtractive?

Answer 7

Additive!

When mixing - get reflected
(Usually white result)

Question 8

What are spectral colours?

Answer 8

Monochromatic light (pure wavelength)

Question 9

What are non spectral colours?

Answer 9

Mixtures of other colours

Ex. Magenta

Question 10

How many colours can we see?

Answer 10

Around 2.3 million

Question 11

What are hues?

Answer 11

Red, orange, yellow, green, followed by blue, indigo and violet

Question 12

What is saturation?

Answer 12

Intensity of colour

Question 13

What is colour solid?

Answer 13

Illustrates relationship among hue, saturation, and value

Question 14

What is value?

Answer 14

Light to dark dimension of colour

Question 15

What is the munsell colour system?

Answer 15

Fun object

Question 16

What is the trichromatic theory of colour vision?

Answer 16

Newton: each component of spectrum must stimulate retina differently

Young-Helmholtz:
3 principle colours
3 receptors

Question 17

What is the behavioural evidence for trichromatic theory of colour vision?

Answer 17

Someone can adjust a wavelength to match another one
Colour matching experiments

Question 18

What is microspectrophotometry?

Answer 18

Measures the absorption/ transmission in either transmitted or reflected light

Microscope thing

Question 19

What is a metamere?

Answer 19

Looks spectral (one pure wavelength) but jdnt

Question 20

What is monochromatism?

Answer 20

Colourblindness that is rare

No cones, only rods

Question 21

What is the principle of univariance ?

Answer 21

Any two wavelengths can cause same response by changing intensity

Question 22

What is a monochromat?

Answer 22

One type of cone/pigment

Question 23

What is a dichromat?

Answer 23

Two types of cone / pigment

Question 24

What is a trichromat?

Answer 24

Three types of cone / pigment

Question 25

What is protanopia?

Answer 25

Missing red (long)

Neutral point = when perceive grey

Question 26

What is Deuteranopia?

Answer 26

Missing green (medium)

Question 27

What is Tritanopia?

Answer 27

Missing blue (small)

Question 28

What is the opponent process theory of colour vision?

Answer 28

Colour vision is caused by opposing responses by (blue and yellow ) and (green and red)

Question 29

What is the evidence for opponent process theory? (2 kinds )

Answer 29

Colour after images

The types of colour blindness (red green and blue yellow)

Question 30

What does the opponent process theory say about primary colours.

Answer 30

All colours are combinations of primary colours

Question 31

Why wasn’t the opponent process theory accepted (three regions)?

Answer 31

1. Helmholtz was famous
2. Maxwells data was sexy (was good research)
3. Didn’t know of any neural mechanisms at the time

Question 32

Describe the Cancelation experiments for opponent process theory?

Answer 32

How much of opposite colour do you have to add to cancel out perception of the first colour

Question 33

What are opponent neurons?

Answer 33

Respond excitatory at one end of spectrum and inhibitory to the other end