vision 3

Question 1

describe the extrastriate blob pathway

Answer 1

blob (layer 2/3), thin stripes in V2, V4

Question 2

describe the interblob extrastriate pathway

Answer 2

interblob (4c Beta), thick stripes in V2, V3 and V4

Question 3

describe the magnocellular extrastriate pathway

Answer 3

4B, thick stripes (V2), V3 and V5

Question 4

what information do the thick stripes relay

Answer 4

movement, orientation, display

Question 5

what information do the thin stripes relay

Answer 5

wavelength

Question 6

V3

Answer 6

form, highest concentration of orientation selective cells

Question 7

V4

Answer 7

color, non wavelength sensitive color, form in association with color,

Question 8

achromatopsia

Answer 8

when you cant see color because you are missing the proper cortical space to perceive it

Question 9

V4 IT (inferotemporal cortex)

Answer 9

colors, shapes, faces, facial recognition, visual perception overall, visual memory

Question 10

V5

Answer 10

middle temporal lobe, retinotopically organized, motion, lesion gives you “snapshot” memory

Question 11

MST

Answer 11

figure out what this stands for, relates to linear, radial, and circular motions, navigation, eye movement

Question 12

types of visual perception

Answer 12

color, shape, size, form

Question 13

color constancy

Answer 13

the light reflected by an object will adjust according to the light it is illuminated with so that you will always

Question 14

lightness constancy

Answer 14

the light reflected by a dark vs. light object will remain proportional depending on the light illuminated on it

Question 15

VA of an object is a measure of the size
of the object’s image on the__________

Answer 15

retina

Question 16

what cues enable us to properly assess depth perception

Answer 16

relative size, interposition, linear perspective, aerial perspective, light and shade

Question 17

what is cataracts and what causes it

Answer 17

opacity which develops in the lens of the eye, possibly due to congenital reasons, most common reason for blindness in the world

Question 18

what is retinitis pigmentosa and what causes it

Answer 18

RP is a genetic abnormality which is from a lack of rods and therefore also a loss of cones, defective dark adaptation/night blindness, then a constriction of the visual field, finally total blindness
-autosomal dominant

Question 19

What is the Argus 2 retinal implant

Answer 19

The Argus 2 retinal implant is a treatment for RP which recreates the image of a visual stimulus on a digitized retina and then stimulates the optic nerve

Question 20

macular degeneration

Answer 20

-less severe dry MD and wet MD, deposits of debris and dead tissue coagulate on the retina causing gradual vision loss
-more severe wet MD causes new growth of blood vessels beneath the retina creating blind spots on vision
-age, smoking, family history

Question 21

how does Anti-VEGF help with macular degeneration

Answer 21

-this therapy blocks the growth of new abnormal blood vessels through injections
-vascular epithelial growth factor

Question 22

glaucoma

Answer 22

occurs as the result of elevated intraocular pressure when the aqueous humor does not have proper drainage from meshwork and too much is produced by the ciliary body

Question 23

ventral stream

Answer 23

goes from occipital lobe towards the temporal lobe, involves object recognition, dominated by parvo and koniocellular pathways

Question 24

dorsal stream

Answer 24

goes from occipital lobe towards parietal lobe, involves motion perception, dominated by magnocellular pathway