PErception

?
Where is the primary visual pathway from eyes to primary visual cortex found?
in the occipital lobe
1 of 39
Where does the left half of the field of view go to?
right sides of left and right eye
2 of 39
Where does the information from the left eye go to?
right lateral geniculate nucleus
3 of 39
Where does this information go to?
The primary visual cortex
4 of 39
What is the order of the the primary visual cortex/
Retina (photoreceptor,bipolar cells, retinal ganglion cells) - optic nerve - lateral geniculate body - visual cortex
5 of 39
What is experimental strategy?
studying different neuronal responses at different stages of the visual pathway
6 of 39
What are the rods?
More abundant,no colour discrimination, sensitive in low light levels, higher density in periphery, rack high rate changes
7 of 39
What are cones?
less abundant, 3 types of discriminate different wavelengths, less sensitive to low lights, higher concentration in fovea, cant follow rapid changes
8 of 39
What do photoreceptors and bipolar cells vary?
Their voltage as they are stimulated
9 of 39
What do subsequent cells do?
Vary spike rate
10 of 39
What are photoreceptor detection of light translated to?
excitation or inhibitation of retinal ganglion cells via bipolar cells
11 of 39
What will a portion of retinal fields in visual stimulation evoke?
Changes in firing rate
12 of 39
What will a portion of retina field in visual stimulation evoke?
a change in firing rate
13 of 39
What is a substructure of receptive fields?
Adescription of how visual stimuli need to be presented in receptive fields of a visual neuron in order to evoke firing rate changes
14 of 39
What do retinal ganglion neurons receive?
input from multiple photoreceptors via bipolar cells
15 of 39
What surrounds receptor fields?
ON/OFF centre
16 of 39
lights presented in 'on' regions excite?
cells
17 of 39
What happens to light in OFF regions?
Inhibits cells
18 of 39
What is the response rate of cells based on?
the sum of stimulation in ON regions -stimulation in OFF region
19 of 39
What is enhanced?
Contrast and boundaries
20 of 39
What do neurons in the lateral genticulate body respond to?
visual stimuli in similar ways to the retinal ganglion cells
21 of 39
What is the first functional significanc of centre surround fields?
The world has lots of thing to stay in contrast, we dont need to keep responding to them
22 of 39
What is responding to only changes and boundaries do?
its efficient
23 of 39
The luminance of features is representated what?
Relative to their surround
24 of 39
What does this do?
Helps preserve appearance of objects regardless of light levels in the environment
25 of 39
REtinal ganglion and LGN cells receive inputs from what?
Cones and are sensitive to colour ->different sensitivities to different wavelengths
26 of 39
What do colour sensitive and LGN neurons have?
Receptive fields that show centre surround colour opponency
27 of 39
What does colour opponency and firing rate adaptation help with?
In retinal ganglion cells can explain negative after images
28 of 39
What are V1 neurons?
They help respond to elongated stimuli with specific orientation, two main types of orientation sensitive V1 neurons
29 of 39
What is the first type of V1 neuron?
simple cells
30 of 39
What do simple cells do?
Fields have inhibitory and excitory regions and can be thought of as combining inputs from ON and OFF cells
31 of 39
What is the second type of V1 neuron?
Complex cells
32 of 39
What do Complex cells do?
have no discrete ON and OFF regions, best response to moving stimuli and can be thought of combining inputs from simple cells
33 of 39
What is retino topic maps/
Orderly mapping of retinal field onto visual cortex
34 of 39
What are modules?
V1 is divided into small colluminar modules that combine neurons sensitive to different aspects of stimuli presented in small part of visual field
35 of 39
To result in perception and memory of the holistic visual properties of whole object and visual scenes what needs to be done?
Information from modules in V1 needs to be combined and further processed
36 of 39
What does this processing do
takes place in visual association corticies (V2-V5, inferior temporal lobe, posterior parietal cortex)
37 of 39
What is blind sight?
Looking or pointing toward visual stimuli, critical for conscious vision, direct LGN projections to the extriate cortex are critical for blindsight
38 of 39
What can blindsight highlight?
The brain can perform visual information processing which can guide subjects behaviours without conscious awareness
39 of 39

Other cards in this set

Card 2

Front

Where does the left half of the field of view go to?

Back

right sides of left and right eye

Card 3

Front

Where does the information from the left eye go to?

Back

Preview of the front of card 3

Card 4

Front

Where does this information go to?

Back

Preview of the front of card 4

Card 5

Front

What is the order of the the primary visual cortex/

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Psychology resources:

See all Psychology resources »See all Perception resources »