UNIT 2 PSYC 492 - 2.27.24 Vision

Question 1

What we see out in the world can be referred to as our:

Answer 1

Visual Field

Question 2

What is the visual field (definition)?

Answer 2

entire area that can be seen during a steady fixation of our gaze in one direction

Question 3

Look at slides:
- Visual Pathway
- Visual Field
- What our eyes see…
- Pathway disruptions and visual field deficits
- (be able to label pathway)

Question 4

Each eye received information from —– visual field.

Question 5

What would happen if you damaged your right optic nerve? What is this condition called?

Answer 5

You would not be able to see out of your right eye, but your left eye would be unaffected.

Monocular Blindness to the right eye

Question 6

Bitemporal hemianopia occurs if there is damage to the —————–. What does this look like?

Answer 6

optic chiasma

With bitemporal hemianopia, you would be unable to see the outer 2/3 of both your left and right eyes’ visual fields.

Question 7

What would happen if you damaged the optic tract on your left side?

What is this called?

Answer 7

You would be unable to see the outer 2/3 of your right eye’s visual field and unable to see the inner 2/3 of your left eye’s visual field. (look at image)

Homonymous hemianopia on the left optic tract

Question 8

Injury to the ——— results in upper left quadrantanopia.

Answer 8

Right optic radiation (portion closer to the eye?)

Question 9

What effect would damage to your left striate cortex have on your left and right visual fields?

What is this called?

Answer 9

You would (mostly) be unable to see the outer 2/3 of your right visual field. You would also (mostly) be unable to see the inner 2/3 of your left eye’s visual field. A small circle in the very center focal point of your visual field is preserved.

This is called occipital damage.

Question 10

In the occipital lobe, what is V1; what is it responsible for?

Answer 10

V1 is the primary visual cortex, aka the striate cortex.

It is responsible for processing:
- light wavelength
- line orientation
- basic feature of shape (i.e., edge detection)

Question 11

What is area V2 in the occipital lobe responsible for?

Answer 11

assembling and mapping information

Question 12

Which area of the occipital lobe is responsible for dynamic form, including motion and depth?

Answer 12

V3

Question 13

What is the function of area V4 in the occipital lobe?

Answer 13

color; some aspects of line orientation and form

Question 14

What is V5’s function?

Answer 14

visual motor detector

Question 15

What are areas V2-V5 in the occipital lobe called?

Answer 15

prestriate/secondary association cortex

Question 16

What are the two pathways for processing information taken in by the occipital lobe? What information is each pathway responsible for processing?

Look at this in book

Answer 16

Dorsal stream: responsible for processing “where” information
Ventral stream: responsible for processing “what” information

Question 17

Name 3 conditions of the visual cortices

Answer 17

• cerebral achromatopsia
• akinetopsia
• cortical blindness (blindsight)

Question 18

What is blindsight and which areas are responsible for it?

Answer 18

Blindsight is “seeing” without actually “seeing,” specifically in people with cortical blindness. (sensory informaiton in the absence of actual sight?)

V1 is responsible for blindsight, but other areas may also be involved.

Question 19

What is cerebral achromatopsia and which areas are responsible for it?

Answer 19

Cerebral Achromatopsia is the inability to perceive color, and it is related to area V4.

Question 20

What is akinetopsia and which area is responsible for it?

Answer 20

inability to perceive motion (they see snapshots from one moment to the next); V5

Question 21

What are disorders of visual processing called? Name three types.

Answer 21

Visual Object Agnosias

• Apperceptive agnosia
• Associative agnosia
• Prosopagnosia

Question 22

What are visual object agnosias?

Answer 22

failures to recognize an object

Question 23

Describe:

apperceptive agnosia

Answer 23

difficulty in object perception; cannot form a whole

Question 24

Describe:

Associative agnosia

Answer 24

difficulty assigning meaning to an object; higher order breakdown

NEED MORE

Question 25

Describe:

Prosopagnosia

Answer 25

an inability to recognize faces