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Flashcards in Vision Deck (145)
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1

Two organizational principles of V1

Topographical mapping and foveal magnification

2

Receptive fields maintain antagonistic center around, produced by combining outputs of LGN cells

Simple V1 cortical cells

3

Respond to stimuli shaped like bars or edges that have a particular slant or orientation (particular angle)

Simple V1 cortical cells

4

Processed in left hemisphere (not just right eye)

Right VF

5

Processed in right hemisphere (not just left eye)

Left VF

6

What does the dark do to photoreceptors?

Depolarizes. More glutamate

7

What range does the left eye see?

1-8

8

What wavelength causes the max response in middle cones?

530 nm

9

When the light entering the eye is focused in front of the retina and stint objects can't be seen sharply. Near sightedness

Myopia

10

How does the lens accommodate for near objects

Convex shape

11

Function similar to horizontal cells

Amacrine cells

12

How does the lens accommodate for far objects

Concave shape

13

Blind spot is created by this

Optic disk

14

Two types of this cell: diffuse (peripheral) and midget (fovea)

Bipolar cells

15

Represents brightness

Amplitude

16

Hardening of the lens. The capsule that encircles the lens becomes less elastic as well. Harder to focus on close things. Old sight

Presbyopia

17

Receptive fields replicate the info passed to them by the bipolar cells. Max response to dots of specific size. Sensitive to contrast

Ganglion cells

18

Colored area. Contains muscles that control the pupil

Iris

19

Most detail and best perception of color in this type of vision

Central vision

20

Long cone defect

Protoanomalous

21

Transparent disk that uses accommodation to focus light rays for near of far distances

Lens

22

Part of environment registered on retina

Visual field

23

No short cone

Tritanope

24

Integrate info from photoreceptors close to one another and communicate through graded potentials with bipolar cells

horizontal cells

25

Why is the cell depolarized in the dark?

Sodium channels are kept open by cGMP. Na+ is allowed in in the dark

26

Organizational principle of V1. Locations on retina and LGN correspond to locations in V1

Topographical mapping

27

How many cells in the visual cortex

200 million

28

Receives input from M ganglion cells. Respond best to large, fast moving objects

Magnocelluar LGN layers

29

What is light?

Particle and a wave. Moving waves of photons

30

How many other cortical areas participate in visual processing other than V1?

At least 12