Visual system part 2 Flashcards Preview

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Flashcards in Visual system part 2 Deck (50)
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1

2

ant; post in primary visual cortex

Peripheral vision; Central vision

3

expanded cortical representation

Central vision

4

goes through macula

and has expanded cortical representation

 Central vision

5

most area 17 neurons have a preference for input

from one eye)(monocular)

6

Axons from LGN course to the primary visual cortex (area 17) and synapse on

layer IV neurons.

7

monocular; binocular

Layer IV neurons; Layer II/III, V and VI neurons

 

8

simple and complex cell

area 17

9

orientation of a line.

simple cell

 

10

may be direction sensitive or respond best to a corner, cross or x.

Complex cells

11

Cell column that prefer the same line orientation

Orientation Column

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Cell clusters that respond to color

Color-Sensitive Region

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wavelength sensitive

Color-Sensitive Region

14

Cell column that respond to input from either the R or L eye OR in the case of binocular cell, have a strong preference for the R or L eye

Ø Ocular Dominance Column

15

17

Hypercolumn

refer to a set of orientation and ocular dominance columns that receive input from a given point in the visual field

18

Primary visual cortex

projects to extrastriate visual areas where neurons require complex stimuli for maximal activation

19

Primary visual cortex respond to 

fundamental aspect of a visual stimulus (orientation, contrast, motion, color, eye of origin)

20

Dorsal (“M”) Stream

where

21

perception of motion

posterior parietal association cortex

(from Dorsal (“M”) Stream)

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visual information travels to the inferior temporal association cortex

Ventral (“P”) Stream

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Ventral (“P”) Stream

what

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size, shape, color, orientation

inferior temporal association cortex

(Ventral (“P”) Stream)

25

inferior temporal cortex

Lesion to V4 

26

Lesion to V1

Scotoma (bind spot)

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Lesion to V5 

parietal pathway

28

achromatopsia

color recognition

(Lesion to V4 à inferior temporal cortex)

29

object recognition

(agnosia)

(• Lesion to V4)

30

face recognition

prosapagnosia

(fusiform face area)

(Lesion to V4)

31

Projections to the superior colliculus play a role in

visual orientating reflexes