lecture 4 visual perception Flashcards
akenotposia
unable to percieve motion, is able to notice object change position but not see it move
COPLVROV
path of light
light enters through the ____, the ___ opens or closes to control the amount of light,___ refract light rays due to ____
causeing a ___ on the retina
through the cornea
iris
cornea
retina layers and uses
1.
2.
3.
photos go to photocreceptors
stimulate bipolor and ganglioncells which make up a bundle of nerve fibers called the optic nerve
responsible for laterial interaction in the retina
amercrine and horozontal cells
center of the retina
fovia
light sensitive cells in back of eye
photoreceptors
2 types of photoceptors adn
1.rods
2. cones
differeiciate between the two
rods: black and white, low light sensitive
cones: COLORRR, not light sensitive
have short, medium, long
what deos the fovia do
what is the relatinsip between fovia and color
as we dec d to fovia, the amt of hue inc
rods popukate the ___ regions of the retina
outer
rods and cones do nit repot direclt to the cortex
true or false
true
where nerual fibers make up rods exit the eye
blind spot
lateral inhibition
pattern of cells stimulate stop activity of other cells
me has 2 guys strapped to a chair, i point a gun at guy a. guy a is SO INTENSLY stimulated/overwhelmed that he screams and guy b stops processing. another guy is in a different room. these guys fear responce goes across to each other and inhibition dec as the cells continue
this is an extreme example of
lateral inhibition
nervous systeme relationsip btw stimulus and epresented activity
visual coding
recod moment by moment electrical changes in a SINGLE neuron
single cell coding
how does single cell coding work?
elecrode is sx into neuron and comp recods firing rate of action potential
center surround cells
firing rste left to right
ex:
ganglion cells inr etina
advangatace of parallel processing
divide and conquer, processing happens alll at once
mutual influence
no watigng for other processes compelte
SERIAL processing
step by step processing
what system does what
damage to this region results in
id of cistual objects
agnosia
where system
processing LOCation of visual obj
damage=
spatial position
visual areas processing feature assignd spatial feature of opj to combine to create a scnee
neural syncrony
fire in a syncronous rythm with each other
form perception,
describe process of seeign an object
- recognize simple visutal features
- arage reature into full obj and give it meaning
- recognize obj
gestalt psych
SPGCS (spugus)
the whoel is different than sum of part
ambigious figure
perception based on knowledge
similarity
tendancy to group into collums
proximity
grouo by closenesss
good continuation
see cont green bar rather than 2 similar thignfs
closeure
fill in broken lines
simplicitity
look at object in the simplest way possible
orginazation features
perpetual process involces
info gathering anf itnerpretation
perceptual constncy
percieve constsnt obj properties through changes shape and size
brightness cosnt
percive brightness of obj accuacy
size constancy
correctly percieve an obj size outside of retinal changes
cpnstancy is inflenced by relationships between objects explain
distance can dec image size and mispercieve size
shape constancy
see shape regardless of retinal changes
distance cues
features of stimulus that indicate obj position
binocular disparity
difference between each eyes view
dept depend on what eye can see by itslef
monocular cues
motion is a distance and depth cue
motion parallax: pattern of motion in retinal imafes
