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Visual Perception > dorsal and ventral streams > Flashcards

dorsal and ventral streams Flashcards

1
Q

dorsal pathway

A

V1>V2>V3>MT/V5>MST

concerned with movement, depth and position

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2
Q

extra-striate cortical area pre-dominantly magnocellular

A

dorsal

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3
Q

ventral pathway

A

V1>V2>V4>IT

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4
Q

extra-striate cortical area pre-dominantly parvocellular

A

ventral pathway

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5
Q

blob region

A

color sensitive (color opponent)

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6
Q

inter-blob region

A

orientation selective (NOT directional or color selective)

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7
Q

thick stripes

A

visual orientation map (where something is in orientation to something

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8
Q

thin stripes

A

color map

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9
Q

inter-stripes

A

disparity map (stereopsis and thickness and size)

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10
Q

M pathway

A

projects layer 4b(V1) to thick stripes(V2)

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11
Q

P-B pathway

A

projects blob(V1) to thin stripes(V2)

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12
Q

P-I pathway

A

projects inter-blob (V1) to thin inter-stripes/pale stripe(V2)

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13
Q

V2 cortical area

A

important in object recognition

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14
Q

blindsignt

A

pt can see moving object after removal of straite cortex. information gets sent from the LGN to the V3/MT and through the dorsal stream

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15
Q

optic ataxia

A

damage to posterior parietal cortex, difficulty with visual motor coordination (reaching), no difficulty recognizing objects

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16
Q

optic ataxia

A

damage to posterior parietal cortex, difficulty with visual motor coordination (reaching), no difficulty recognizing objects

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17
Q

prosopagnosia

A

cannot identify faces/distinguish facial features

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18
Q

inferotemporal cortex

A

cells respond selectively to complex forms such as pictures of faces

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19
Q

visual form agnosia

A

impaired ventral stream; damage to ventral occipital and posterior temporal cortex; difficulty recognizing and discriminating objects

20
Q

good manual estimation

A

Optic ataxia

21
Q

good grasp calibration

A

ventral form agnosia

22
Q

bad manual estimation (cannot show size of water bottle)

A

ventral form agnosia

23
Q

bad grasp calibration (cannot grab water bottle/track motion)

A

optic ataxia

24
Q

which pathway has a quicker conduction time

A

dorsal stream

25
Q

which pathway has a slower conduction time

A

ventral stream

26
Q

disorders with dorsal visual stream difficulty

A

william’s syndrome, preterm birth, dyslexia, autism, (and possibly fetal alcohol syndrome)

27
Q

TMS

A

“Transcranial Magnetic Stimulation”. oscilating magnetic field generated within the TMS coil pass through the skull and induce a current in the underlying cortex (activates neurons)

28
Q

rTMA

A

“virtual lesion”

29
Q

waterfall illusion

A

occurs after motion adaptation

30
Q

optic flow

A

motion of all surface elements from the visual world ( can determine current direction of movement from these surfaces)

31
Q

form perception

A

the ability to segment the spatial attributes (size and shape) of a single entity from other entities and from background

32
Q

form perception

A

the ability to segment the spatial attributes (size and shape) of a single entity from other entities and from background

33
Q

detection

A

determines the presence or absence of an object.

34
Q

discrimination

A

the ability to distinguish one object from another - more refined process

35
Q

identification

A

recognizing and labeling a particular item

36
Q

processes faces, objects and places

A

ventral pathway

37
Q

grouping laws

A

proximity, similarity, orientation, closure, good continuation, familiarity, adaptation, face recognition

38
Q

closure

A

tend to fill out incomplete detais to form good figures

39
Q

good continuation

A

the visual system prefers continuity, connecting a particular path from a random figure

40
Q

familiarity

A

you will see put together an image from specs if similar to something you know

41
Q

adaptation to intensity

A

saccades keep edges “alive, subtle intensity gradient doesn’t create large enough saccades to re-trigger edge detectors

42
Q

moon illusion

A

size illusion - moon looks larger on horizon than above

43
Q

muller-lyer illusion

A

lines going away make room look bigger and lines going in make room look smaller….

44
Q

spatial vision

A

variations in luminance across space

45
Q

examples of spatial vision

A

visual acuity and contrast sensitivity

Visual Perception (9 decks)

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