chapter 4 Flashcards

1
Q

extrastriate cortex

A

the regions that border v1, progressively tuned for more complex features

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2
Q

depth

A

when one object is in front of another, there will be a visual border formed between the object and the background

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3
Q

gestalt

A

pattern or configuration

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4
Q

gestalt psychology

A

wertheimer, kohler, kofka

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5
Q

illusory contour

A

a false edge that is perceived but is not present in the physical stimulus

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6
Q

occlusion

A

when an object is covered up by another object

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7
Q

good continuation

A

two elements will tend to group together if they seem to fall on the same line

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8
Q

closure

A

a closed contour is preferred to an open contour

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9
Q

texture segmentation

A

parsing an image into regions of common texture properties

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10
Q

similarity

A

features group together if similar in size/shape/etc

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11
Q

proximity

A

features group together if they are close to each other

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12
Q

parallelism

A

parallel contours tend to group together

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13
Q

symmetry

A

symmetrical regions are more likely to be grouped

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14
Q

figure-ground segmentation

A

the process of determining which item belongs to the foreground and which item belongs in the background

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15
Q

global superiority effect

A

many experiments suggest that the properties of the whole object dominate local identities

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16
Q

common problems for mid level vision

A

inferring edges
texture grouping
figure vs ground
occlusion
global vs local

17
Q

gestalt principles that help sole edge detection

A

good continuation
closure
similarity
proximity
parallelism
symmetry

18
Q

problems with gestalt principle

A

finding edges, texture segmentation, figure ground segmentation, wholes and parts

19
Q

what are the three basic challenges to object recognition?

A

multiple viewpoints, multiple classes of the same object, recognizing objects at different levels of specificity

20
Q

visual agnosia

A

the inability to recognize objects in spite of the ability of being able to see them

21
Q

apperceptive agnosia

A

low level vision is intact but cannot discriminate simple objects

22
Q

associative agnosia

A

can easily perceive objects as a whole but cannot verbally name them

23
Q

prosopagnosia

A

can perceive and name objects normally except for faces

24
Q

reasons why face processing is special

A

global effects, expertise, emotion

25
Q

thatcher illusion

A

face inversion effect

when you rearrange the parts of an upside down face, it’s hard to notice and often seen as evidence that face face processing is global and orientation specific

26
Q

global effects

A

face recognition is not due to recognizing simple features, but also the overall continuation of features

27
Q

expertise

A

most people have an extreme amount of practice recognizing faces compared to other object classes

28
Q

emotion

A

faces often change as a function of emotional expression