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Biopsych Exam 4 > Slide 2 > Flashcards

Slide 2 Flashcards

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1
Q

What is the major visual info processing pathway

A

retina geniculate striate pathway

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2
Q

what percent of axons leaving the retina use this pathway?

A

90 %

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3
Q

Name the 2 portions of the retina which cover diff parts of the visual system

A
  • temporal hemi-retina

- nasal hemi-retina

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4
Q

Describe the left visual field

A
  • nasal retina
  • from left side
  • crosses
  • temporal retina
  • from right side
  • does not cross
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5
Q

What is the optic chiasm

A

where axons coming from nasal retina cross

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6
Q

What is the lateral geniculate nucleus?

A
  • thalamic nucleus
  • relays visual info
  • from retina
  • to visual cortex
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7
Q

What is the striate cortex?

A

primary visual cortex (aka V1)

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8
Q

Info from left visual field goes to ____ V1

Info from right visual field got to _____ V1

A
  • right

- left

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9
Q

True or false: in the lateral geniculate striate pathway there are both ipsilateral and contralateral projections

A

true

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10
Q

From where do P channels get majority of info?

A

cones

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11
Q

What do P channels respond to

A
  • color

- fine details

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12
Q

From where do M channels get majority of info?

A

rods

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13
Q

What do M channels respond to

A

-movement

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14
Q

Where is the striate cortex located

A
  • deep in occipital lobe

- around calcarine fissure

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15
Q

Where does the first stage of viusal processing occur in the cerebral cortex

A

V1 (striate/visual cortex)

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16
Q

How many layers of cells does the V1 have

A

6

17
Q

Which layer does the lateral geniculate nucleus project to?

A

4th layer

18
Q

Describe organization of the visual cortex and lateral geniculate nucleus

A
  • topographical

- retinotopic organization

19
Q

What is retinotopic organization?

A

organized like a map of the retina

20
Q

Which part of the retina receives a large representation in retinotopic organization?

A

fovea

21
Q

Evidence for retinotopic organization

A

image is imprinted on the visual cortex

22
Q

What is the receptive field

A
  • area of visual field
  • within which it is possible
  • for visual stimulus
  • to influence activity of a given neuron
23
Q

True or false: receptive fields come in diff shapes

A

true

24
Q

Who were the scientists who studied receptive field

A

hubel and wiesel

25
Q

Receptive fields in the fovea are ______

A

smaller

26
Q

What shape are most receptive fields of visual neurons

A

circular

27
Q

What are monocular receptive fields

A

only respond to stimulation in 1 eye

28
Q

true or false: neurons have monocular receptive fields

A

true

29
Q

Describe the processes of an on center cell

A

light in center of cell causes excitatory response

light in surround of cell causes inhibitory response

30
Q

Describe the processes of an off center cell

A

light in center of cell causes inhibitory response

light in surround of cell causes excitatory response

31
Q

What happens in light is simultaneously shone in center/off center of cell

A
  • null effect

- cancel each other out

32
Q

What kind of receptive fields do neurons in layer 4 of the lateral geniculate nucleus have?

A
  • small

- circular

33
Q

What kind of receptive fields do neurons in the rest of the lateral geniculate nucleus have?

A
  • bars of light

- lines, bar and sine wave grating

34
Q

How responsive are neurons in the rest of the lateral geniculate nucleus (not in layer 4) to small spots of light

A

not very responsive

35
Q

What are the two major classes of V1 cortex cells

A

simple cells

complex cells

36
Q

What do simple cells respond to?

A

lines/bars

of specific orientaton

37
Q

Describe complex cells

A
  • rectangular
  • orientation sensitive
  • larger receptive fields
  • mainly binocular
38
Q

What do complex cells usually respond to and why?

A
  • line moving across visual field

- cuz lack on/off regions

Biopsych Exam 4 (3 decks)

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