Chapter 7 Flashcards
Does information has different representational states
Yes, it may be in mind, slides, computer etc
What are different cognitive processes
Thinking, learning, attention, problem solving
Does human is also an information processor with input and output channels
Yes
What is vision
- Human eye
- Visual perception
The input channels for human called what
senses
The output channels for human called what
responders / effectors
What are examples of input channels/senses for human
- Vision
- Hearing
- Touch
- Taste
- Smell
What are examples of output channels/responders for human
- Limbs
- Eyes
- Fingers
- Head
- Vocal system
What are 2 stages of visual perception
- Physical reception of the stimulus
2. Processing of stimulus
How image process in human eye
with the help of cornea, retina and lens
When we come from darkness to light suddenly, why we can not see immediately
Because of rods
What part of eye responsible for color vision
Cones
How much types are of cones
3
What is blind spot in eye
It is a place in eye where there is no rods and cones.
What are 2 types of nerve cells in eye
- X-cells (They detects patterns)
2. Y-cells (They detects movements)
What are 3 basic factors for visual perception
- Size & death
- Brightness
- Color
What is visual angel
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.
What is visual acuity
Visual acuity is the ability of a person to perceive fine details
Which objects we cannot see
Object with visual angels smaller than 0.5 seconds of an arc
What is law of size constancy
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.
What are other factors that effect visual perception
- Perception of death
- Size and height of object
- Familiarity
What is Perception of death
Cues to determine relative position of objects. Objects overlapping
What is Size and height of object
Provides cue for distance
What is brightness
Subjective reaction to levels of light. It depends upon luminance of an object
What is luminance
Amount of light falling on an object.
What is contrast
Function of luminance of an object and the luminance of its background.
Does visual acuity increases with luminance
Yes
What is flicker
Eye perceives that image is not stable and it is moving
Does larger the screen larger the flicker
Yes
What are 3 components of color
- Hue
- Intensity
- Saturation
What is hue
Hue is determined by the spectral wavelength
Blue (short)
Green (medium)
Red (long)
How much hues our eye can determine
150
What is intensity
Brightness of color
What is saturation
Amount of whiteness in color
How many color can be perceived by human eye
7 million
What is color blindness
Inability to differentiate between green and red.
What is context illusions
Ambiguity for something because of lack of context
What is muller layer illusion
An optical illusion because of concave and convax effect
What are over compensation illusions
An optical illusion due to distance effect also known as ponzo illusion
What is proof-reading illusion
Illusion during reading
What is lines and optical center illusion
We treat lines as
Horizontal: magnified
Vertical: reduced
And we cannot recognize center of page
