Vocabulary Terms for Chapter 10

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Cue Approach to Depth Perception

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Vocabulary terms from Ch. 10 to study in preparation for the exam.

30 Terms

1

Cue Approach to Depth Perception

Focuses on identifying information in the retinal image that is correlated with depth in the scene.

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2

Occlusion

When one object hides or partially hides another object from view, causing the hidden object to be perceived as being farther away.

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3

Monocular Cues

Cues based on the visual information available within 1 eye.

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4

Binocular Cues

Cues that depend on visual information within both eyes.

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5

Oculormotor Cues

Depth cue that depends on our ability to sense the position of our eyes & the tension in our eye muscles.

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6
<p>Convergence</p>

Convergence

Inward movement of the eyes that occurs when we look at nearby objects.

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7
<p>Accommodation</p>

Accommodation

Change in the shape of the lens that occurs when we focus on objects at various distances.

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8

Oculomotor

Sources of depth information in a two-dimensional picture.

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9

Relative Height

Objects below the horizon that are higher in the field of vision are more distant.

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10

Familiar Size

Distance information is based on our knowledge of the object size.

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11
<p>Perspective Convergence</p>

Perspective Convergence

The perception that parallel lines in the distance converge as distance increases.

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12
<p>Atmospheric Perspective</p>

Atmospheric Perspective

Distant objects are fuzzy & have a blue tint.

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13
<p>Texture Gradient</p>

Texture Gradient

Equally spaced elements are more closely packed as distance increases.

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14
<p>Shadows</p>

Shadows

Decreases in light intensity caused by the blockage of light can provide information regarding the locations of these objects.

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15

Motion-Produced Cues

When the observer is not stationary, the observer is moving.

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16

Motion Parallax

As an observer moves, nearby objects appear to move rapidly across the visual field whereas far objects appear to move more slowly.

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17
<p>Deletion</p>

Deletion

Covering an object.

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18

Accretion

Uncovering an object.

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19
<p>Stereoscopic Depth Perception</p>

Stereoscopic Depth Perception

Depth perception created by input from both eyes.

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20

Binocular Disparity

Occurs when the retinal images of an object fall on disparate points on the 2 retinas.

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21

Corresponding Retinal Points

Points on the retina that would overlap if the eyes were superimposed on each other (EX: if there is overlap, there is no disparity).

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22

Horopter

An imaginary surface that passes through the point of fixation (all this area is in focus).

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23

Noncorresponding Points

2 points, 1 on each retina, that wouldn’t overlap if the retinas were slid onto each other.

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24

Absolute Disparity

The visual angle between the images of an object on the 2 retinas.

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25

Crossed Disparity

Occurs whenever an object is closer to the observer than where the observer is looking.

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26

Uncrossed Disparity

Occurs whenever an object is behind the horopter.

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27
<p>Visual Angle</p>

Visual Angle

The angle of an object relative to an observer’s eyes.

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28
<p>Size Constancy</p>

Size Constancy

Occurs when the size of an object is perceived to remain the same even when it’s viewed from different distances.

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29

Size-Distance Scaling

A hypothesized mechanism that helps maintain size constancy by taking an object’s perceived distance into account.

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30
<p>Relative Size</p>

Relative Size

When 2 objects are of equal size, the one that is farther away will take up less of the field of view. We often use the sizes of familiar objects as a yardstick to judge the size of other objects.

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