Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Perception Exam 2 > Chapter 5- > Flashcards

Chapter 5- Flashcards

1
Q

What are the 3 steps to color perception?

A

1) Detection-wavelengths must be detected
2) Discrimination-We must be able to tel the difference between one wavelength
3) Appearance - We want to assign perceived colors to lights and surfaces in the world

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

S-cone

A

a cone that is preferentially sensitive to short wavelengths (420nm)- blue cone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

M-cones

A

A cone that is preferentially sensitive to middle wavelengths: Colloquially but not entirely known as (535nm) green cone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

L-Cone

A

A cone that is preferentially sensitive to long wavelengths -(565nm) “red cone”

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Isaac Newton

A
  • “Light does not have color, we internally perceive color”
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are typical light sources?

A

Most of the light we see is reflected: Sun, Light bulb, fire

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What range of the electromagnetic spectrum is visible light?

A

400-700nm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Newtons theory : wrong

A

Seven Kinds of light–> seven kinds of photoreceptors

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Thomas Young’s Theory- right

A

Continuum of light –> three kinds of photoreceptors (not including rods)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Photopic

A

Light intensities that are bright enough to stimulate the cone receptors and bright enough to saturate the rod receptors to their maximum responses
*Ex: Sunlight and bright indoor lighting are both photopic light conditions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Scotopic

A

Light intensities that are bright enough to stimulate the rod receptors but too dim to stimulate the cone receptors
*Ex: moonlight and extremely dim indoor lighting are both scotopic light conditions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Color Discrimination: The principle of Univariance

A

photoreceptors can only respond more or less depending on how many quanta they have absorbed –Cannot whisper in your ear what the wavelengths of quanta were.
CONES ARE COLORBLIND

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Rods

A

only sensitive to scotopic levels

  • All rods contain the same photopigment molecule: Rhodopsin
  • rods have the same sensitivity to various wavelengths of light
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Metamer

A

-perceptually identical but not identical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

One receptor system

A

One receptor type, one light=match
two receptor types, two lights =match
Rule: Output= input sensitivity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Trichromacy

A

The theory that the color of any light is defined in our visual system by the relationships of three numbers, the outputs of three receptors types now known to be the three cones

17
Q

Additive color mixing

A
  • shine lights together to see what they create

ex: Blue plus yellow lights create white wavelengths

18
Q

pointilism - painting

- technology

A
  • dots of color

- eyes blur color to see certain colors (additive color)

19
Q

Subtractive color mixing: A mixture of pigments

A

taking light away

-yellow backpack- absorb blue light

20
Q

Color Space

A

A three dimensional space that describes all the colors
-RGB color space
HSB color space

21
Q

RGB color Space

A

Defined by the outputs of long medium and short wavelengths lights (ie red green, blue)

22
Q

HSB color space

A

defined by hue saturation and brightness
Hue- the chromatic color aspect
saturation-the chromatic strength of a hue
brightness- the distance from clack in color space

23
Q

Color Opposites

A

Red vs green
blue vs yellow
dark vs light

24
Q

Opponent color theory

A

The theory that perception of color depends on the output of three mechanisms: each of them based on an opponency between two colors: red-green, blue– yellow black-white

25
Q

s

A

ganglion cell projecting to fovea -

26
Q

Legal vs illegal colors

-Ewald Hering (1834-1918)

A

can have: bluish green reddish yellow, but never have reddish green or bluish yellow

27
Q

Does everyone see colors the same way?

A

NO
male population 8% colorblind
female population .05%
color anomalous

28
Q

Deuteranope

A

Absence of M-cones-green

29
Q

Protanope Color Blindess

A

Due to absence of L-cones -red

30
Q

Tritanope

A

Due to absence of S-cones -blue

31
Q

Cone monochromat

A

Has only one cone type-truly color blind

32
Q

Achromatopsia

A

An inability to perceive colors that is caused by central nervous system

33
Q

Related color

A

Brown or gray

34
Q

Unrelated color

A

A color that can be experienced in isolation

35
Q

Luminance

A

The visual system knows that light changes but not hue

36
Q

Mantis Shrimp

A

-16 receptor types

Perception Exam 2 (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions