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Perception Exam 2 > Chapter 6-Space Perception and Binocular Vision > Flashcards

Chapter 6-Space Perception and Binocular Vision Flashcards

(53 cards)

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1
Q

Realism

A

The external world exists

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2
Q

Positivists

A

The world depends on the evidence of the senses; it could be hallucination

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3
Q

Euclidian Geometry

A

Parallel lines remain parallel as they are extended in space

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4
Q

Is the retinal image Euclidian?

A

No- brain works with non- Euclidian dimensions all the time

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5
Q

Rabbit Visual field :

A

Prey- who is going to eat me

can see all around and above

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6
Q

Human visual field

A

Predator- Who am I going to eat

Since eyes at the front can only see in front a little to the sides

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7
Q

Probability summation

A
  • The increased probability of detecting a stimulus from having two or more samples
  • since we have two eyes focusing on same thing we can protect one thing (ex food)
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8
Q

Binocular Summation

A

The combination (or summation) of signals from each eye in ways that make performance on may tasks better with eyes than with either eye alone

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9
Q

Binocular Disparity

A

The differences between the two retinal images of the same scene

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10
Q

Depth cue

A

Information about the third dimension (depth) of visual space

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11
Q

Monocular Depth cue

A

A depth cue that is available even when the world is viewed with one eye alone
-predator and prey can do this

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12
Q

Binocular Depth Cue

A

A depth cue that relies on information from both eyes

-

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13
Q

Occlusion or interposition

A

A cue to relative depth order in which for example one object partially obstructs the view of another object

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14
Q

Metrical depth cue

A

A depth cue that provides quantitative information about distance in the third dimension

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15
Q

Nonmetrical depth cue

A

A depth cue that provides information about the depth order (relative depth but not depth magnitude

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16
Q

Relative size

A

A comparison of size between items without knowing the absolute size of either one

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17
Q

Relative height

A

For objects touching the ground those higher in the visual field appear to be farther away in the sky above the horizon objects lower in the visual field appear to be farther away

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18
Q

Texture gradient

A

A depth cue based on the same geometric fact that items of the same size form smaller closer spaced images the farther away they get

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19
Q

A familiar size

A

A cue based on knowledge of the typical size of objects

-if you know size of something you can guess distance based on size you see

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20
Q

Relative metrical depth cue

A

A depth cue that could specify, for example, that object A is twice as far away as object B without providing information about the absolute distance to either A or B

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21
Q

Absolute metrical depth cue

A

A depth cue that provides quantifiable information about distance in the third dimension (eg his nose sticks out 4cm infront of his face

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22
Q

Aerial persepective

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A

A depth cue based on the implicit understanding that light is scattered through the atmosphere-(example see blue different blue for sky and mountain)

23
Q

Linear perspective

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A

Lines that are parallel in three dimensional world will appear to converge in a two-dimensional image as they extend into the distance

24
Q

Vanishing point

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A

the apparent point at which parallel lines receding in depth converge

25
Pictorial depth cue
A cue to distance or depth used by artists to depict three dimensional depth in two dimensional pictures
26
Anamorphosis or anamorphic projection
use of the rules of linear perspective to create a two dimensional image so distorted that it looks correct only when viewed from a special angle or with a mirror that counter the distortion
27
Motion parallax
images closer to the observer move faster across the visual field than images farther away
28
Accommodation
The process by which the eye changes its focus (in which the lens gets fatter as the gaze is directed toward the nearer objects )
29
Convergence
The ability of the two eyes to turn inward often used to focus on nearer objects
30
Divergence
The ability of the two eyes to tune outward often used to focus on to farther objects
31
Shadow cues
- shadows give us
32
stereoscopic vision geometry
-the way to get all the info from motion paralax without having to move : Two eyes see two different position
33
Corresponding retinal points
A geometric concept stating that points on the retina of each eye, where the monocular retinal images of a single object are formed, are at the same distance from the fovea in each eye
34
Horopter (vieth-Müller circle)
the location of objects whose images fall on geometrically corresponding points in the two retinas -The location of objects whose images lie on corresponding points
35
Diplopia
Double vision- if visible in both eyes, stimuli falling outside of panum's fusional area will apear
36
Panum's fusional area
The region of space in front of and behind the horopter within which binocular single vision is possible
37
Crossed Disparity
The sign of disparity created by objects in front of the plane of the horopter -->
38
uncrossed disparity
- the sign of disparity created by objects behind the plane of fixation
39
Stereoscope
A device for presenting one mage to one eye and another image to the other eye
40
free fusion
The technique of converging (crossing) or diverging (uncrossing) the eyes in order to view a stereogram without a steroscope
41
Stereoblindness
An inability to make use of binocular disparity as a depth cue
42
Random Dot stereogram (RDS)
A stereogram made of a large number of randomly placed dots
43
cyclopean
referring to stimuli that are defined by binocular disparity alone
44
Uniqueness constraint-
The observation that a feature in the world is represented exactly once in each retinal image
45
Continuity constraint
The observation that except at the edges of objects neighboring points in the world lie at similar distances from the viewer
46
The Bayesian Approach
A way of formalizing the idea that our perception is a combination of the current stimulus and our knowledge about the conditions of the world-- what is and is not likely to occur
47
Ames room
-perspective room- looks like 90* angles but not 90* angles
48
Binocular Rivalry
The competition of two eyes for control of visual perception
49
Strabismus
A misalignment of the two eyes such that a single object in space is imaged on the fovea of one eye and on the non foveal area of the other eye
50
Esotropia
Strabismus in which one eye deviates inward
51
Exotropia
Strabismus in which one eye deviates outwards
52
Suppression
In vision, the inhibition of an unwanted image
53
Amblyopia
Permanent suppression of one eyes input in visual cortex

Perception Exam 2 (4 decks)

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