Deck 8: Colour Vision

Question 1

A traditional subtractive mixture of blue and yellow pigments normally appears:

A) White
B) Green
C) Orange
D) Red

Answer 1

B

Question 2

After adapting to a blue field, the apparent hue of a neutral test field is

A) Red
B) Grey
C) Green
D) Yellow

Answer 2

D

Question 3

Stable colour appearance despite large changes in the spectrum of the illuminating light is known as:

A) Colour assimilation
B) Colour contrast
C) Colour constancy
D) Colour deficiency

Answer 3

C

Question 4

Double-opponent colour selective cells are found in

A) Visual cortex
B) LGN
C) Superior Colliculus
D) Retina

Question 5

When the full range of cues is available, colour constancy attains a level of

A) 0.11
B) 0.53
C) 0.83
D) 1

Question 6

Colour deficient observers:

A) Have no colour perception
B) See the same range of colours as other observers, but use different colour names.
C) Have a reduced capacity to discriminate between colours.
D) See more colours than other observers, so use different colour names.

Question 7

Dichromats lack:

A) One cone class
B) Two cone classes
C) Three cone classes
D) Rods

Question 8

The spectral sensitivities of which pair of receptors are largely overlapping?

A) Visual cortex
B) S- and M- cones
C) S- and L- cones
D) S-cones and rods

Question 9

Which statement about congenital colour deficiency is correct:

A) Can be diagnosed using pseudo-isochromatic plates
B) Is more common in females than males
C) Is transmitted by genes on the Y chromosome
D) Affects 1 in 200 people

Question 10

A surface will appear more red than another surface if cone responses to it show a greater preponderance of:

A) S-cone activity
B) M-cone activity
C) L-cone activity
D) S-cone plus M-cone activity

Question 11

A blue disc appears less saturated when on a blue background than when on a yellow background. This effect is known as:

A) Colour contrast
B) Colour constancy
C) Colour adaptation
D) Colour deficiency

Question 12

An additive colour mixture additive mixture of red and green lights normally appears:

A) White
B) Yellow
C) Orange
D) Blue

Question 13

Normal human colour vision is:

A) Monochromatic
B) Dichromatic
C) Trichromatic
D) Tetrachromatic

Question 14

In the CIE chromaticity diagram, colour saturation varies with

A) Distance from the centre
B) Angle around the circumference
C) X location
D) Y location

Question 15

According to the principle of univariance, the response of a single cone is the same regardless of:

A) Intensity.
B) Wavelength
C) Adaptation level
D) Contrast

Question 16

The major theories of human colour vision were all originally developed from

A) Anatomical research
B) Physiological research
C) Perceptual research
D) Computational research

Question 17

S-cones absorb predominantly in which part of the visible spectrum?

A) Red
B) Yellow
C) Green
D) Blue

Question 18

Two lights which appear white when added together are said to be:

A) Complementary
B) Metamers
C) Non spectral
D) chromatic

Question 19

The opponent processing stage of dual-process colour theory involves

A) Two chromatic channels and one achromatic channel
B) Two chromatic channels and two achromatic channels
C) Three chromatic channels and one achromatic channel
D) Three chromatic channels and two achromatic channels

Question 20

Which kind of observer has a neutral point on the spectrum where light appears to be colourless?

A) Normal trichromats
B) Dichromats
C) Anomalous trichromats
D) Monochromats