UNIT 2 PSYC 492 - 2.27.24 Vision Flashcards
What we see out in the world can be referred to as our:
Visual Field
What is the visual field (definition)?
entire area that can be seen during a steady fixation of our gaze in one direction
Look at slides:
- Visual Pathway
- Visual Field
- What our eyes see…
- Pathway disruptions and visual field deficits
- (be able to label pathway)
Each eye received information from —– visual field.
What would happen if you damaged your right optic nerve? What is this condition called?
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
Bitemporal hemianopia occurs if there is damage to the —————–. What does this look like?
optic chiasma
With bitemporal hemianopia, you would be unable to see the outer 2/3 of both your left and right eyes’ visual fields.
What would happen if you damaged the optic tract on your left side?
What is this called?
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
Injury to the ——— results in upper left quadrantanopia.
Right optic radiation (portion closer to the eye?)
What effect would damage to your left striate cortex have on your left and right visual fields?
What is this called?
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.
In the occipital lobe, what is V1; what is it responsible for?
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)
What is area V2 in the occipital lobe responsible for?
assembling and mapping information
Which area of the occipital lobe is responsible for dynamic form, including motion and depth?
V3
What is the function of area V4 in the occipital lobe?
color; some aspects of line orientation and form
What is V5’s function?
visual motor detector
What are areas V2-V5 in the occipital lobe called?
prestriate/secondary association cortex
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
Dorsal stream: responsible for processing “where” information
Ventral stream: responsible for processing “what” information
Name 3 conditions of the visual cortices
- cerebral achromatopsia
- akinetopsia
- cortical blindness (blindsight)
What is blindsight and which areas are responsible for it?
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.
What is cerebral achromatopsia and which areas are responsible for it?
Cerebral Achromatopsia is the inability to perceive color, and it is related to area V4.
What is akinetopsia and which area is responsible for it?
inability to perceive motion (they see snapshots from one moment to the next); V5
What are disorders of visual processing called? Name three types.
Visual Object Agnosias
- Apperceptive agnosia
- Associative agnosia
- Prosopagnosia
What are visual object agnosias?
failures to recognize an object
Describe:
apperceptive agnosia
difficulty in object perception; cannot form a whole
Describe:
Associative agnosia
difficulty assigning meaning to an object; higher order breakdown
NEED MORE
Describe:
Prosopagnosia
an inability to recognize faces
