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Human Computer Interaction - CS408 > Chapter 7 > Flashcards

Chapter 7 Flashcards

1
Q

Does information has different representational states

A

Yes, it may be in mind, slides, computer etc

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2
Q

What are different cognitive processes

A

Thinking, learning, attention, problem solving

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3
Q

Does human is also an information processor with input and output channels

A

Yes

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4
Q

What is vision

A
  • Human eye

- Visual perception

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5
Q

The input channels for human called what

A

senses

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6
Q

The output channels for human called what

A

responders / effectors

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7
Q

What are examples of input channels/senses for human

A
  1. Vision
  2. Hearing
  3. Touch
  4. Taste
  5. Smell
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8
Q

What are examples of output channels/responders for human

A
  1. Limbs
  2. Eyes
  3. Fingers
  4. Head
  5. Vocal system
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9
Q

What are 2 stages of visual perception

A
  1. Physical reception of the stimulus

2. Processing of stimulus

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10
Q

How image process in human eye

A

with the help of cornea, retina and lens

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11
Q

When we come from darkness to light suddenly, why we can not see immediately

A

Because of rods

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12
Q

What part of eye responsible for color vision

A

Cones

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13
Q

How much types are of cones

A

3

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14
Q

What is blind spot in eye

A

It is a place in eye where there is no rods and cones.

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15
Q

What are 2 types of nerve cells in eye

A
  1. X-cells (They detects patterns)

2. Y-cells (They detects movements)

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16
Q

What are 3 basic factors for visual perception

A
  1. Size & death
  2. Brightness
  3. Color
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17
Q

What is visual angel

A

A line comes from top of object and a line comes
from bottom of object. Where there they cross in human eye is called visual angel. Size
of object is specified by visual angel. Closer things have bigger visual angel and things
which are far away have smaller visual angel. It is measured in degrees.

18
Q

What is visual acuity

A

Visual acuity is the ability of a person to perceive fine details

19
Q

Which objects we cannot see

A

Object with visual angels smaller than 0.5 seconds of an arc

20
Q

What is law of size constancy

A

We see an object and we perceive its size. When objects start to move away from us, we still
see the same size of object. This is called law of size constancy.

21
Q

What are other factors that effect visual perception

A
  • Perception of death
  • Size and height of object
  • Familiarity
22
Q

What is Perception of death

A

Cues to determine relative position of objects. Objects overlapping

23
Q

What is Size and height of object

A

Provides cue for distance

24
Q

What is brightness

A

Subjective reaction to levels of light. It depends upon luminance of an object

25
Q

What is luminance

A

Amount of light falling on an object.

26
Q

What is contrast

A

Function of luminance of an object and the luminance of its background.

27
Q

Does visual acuity increases with luminance

A

Yes

28
Q

What is flicker

A

Eye perceives that image is not stable and it is moving

29
Q

Does larger the screen larger the flicker

A

Yes

30
Q

What are 3 components of color

A
  1. Hue
  2. Intensity
  3. Saturation
31
Q

What is hue

A

Hue is determined by the spectral wavelength
Blue (short)
Green (medium)
Red (long)

32
Q

How much hues our eye can determine

A

150

33
Q

What is intensity

A

Brightness of color

34
Q

What is saturation

A

Amount of whiteness in color

35
Q

How many color can be perceived by human eye

A

7 million

36
Q

What is color blindness

A

Inability to differentiate between green and red.

37
Q

What is context illusions

A

Ambiguity for something because of lack of context

38
Q

What is muller layer illusion

A

An optical illusion because of concave and convax effect

39
Q

What are over compensation illusions

A

An optical illusion due to distance effect also known as ponzo illusion

40
Q

What is proof-reading illusion

A

Illusion during reading

41
Q

What is lines and optical center illusion

A

We treat lines as
Horizontal: magnified
Vertical: reduced
And we cannot recognize center of page

Human Computer Interaction - CS408 (41 decks)

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