Higher Visual Processing Flashcards Preview

Jason's Neuro Block > Higher Visual Processing > Flashcards

Flashcards in Higher Visual Processing Deck (36):
1

M and P pathways encode for? where do they terminate in V1?

M- motion 4C-alpha
P - colour 4C-beta

2

outputs of V1 layers?

3 = other cortical
5 = sup. colliculus/pons
6 = LGN

3

M ganglions project to which layer of LGN?

magnocellular layer

4

when does mixing occur with M ganglions?

AFTER entering primary visual cortex

5

What happens in Layer IVB of V1?

get directional selectivity

6

how much of cortex involved with visions?

40%

7

what are the 2 large cortical streams of visual processing?

M-cells: dorsal pathway
P-cells: ventral pathway

8

dorsal pathway detects?

where in visual field

9

Where do you get directional selectivity?

Layer IV-B in V1

10

ventral pathway detects?

what in visual field

11

Middle temporal lobe is for?

specialized for precessing object motion

12

Middle temporal lobe receives from 3 big places?

V2, V3, Layer IV-B of V1

13

almost all Cells in the Middle temporal lobe are?

directional selective to movement

14

3 kinds of cones are? maximal absorption at?

Red: 560
Green: 530
Blue: 430

15

How does colour vision work? 2 steps:

1. detect relative amounts of cones working
2. comparison to each other

16

Red opposed by?

Green

17

Blue opposed by?

Yellow

18

P ganglions exhibit what kind of detection?

colour opponent centre surround

19

colour opponent centre surround means?

excited by red on centre
inhibited by green on surround

20

brain likes what kind of stimulation for light detection?

either maximal stim
maximal inhibition

21

Area V4 is important for perception of?

shape
colour

22

Area inferior temporal is a major output of?

V4

23

What does Area inferior temporal perception of?

faces

24

colour deficiencies happen how? 2 ways

inherited
acquired

25

male vs. female colour deficiencies?

8% males
0.5% females

26

What is: Monochromacy, Dichromacy, Anomalous trichromacy?

Monochromacy: only have one type of cone
Dichromacy: two functioning cones
Anomalous trichromacy: have 3 cones, one expresses abnormal pigment

27

Which is most common? Monochromacy, Dichromacy, Anomalous trichromacy?

Anomalous trichromacy

28

What is Tritan?

No blue cone

29

What is protan?

No red cone

30

What is Deutan?

No green cone

31

Which cone is deficient most commonly?

Green (Deutan)

32

Deutanopes with traffic lights: trouble how?

confuse red and yellow

33

protanopes with traffic lights: trouble how?

can't see red easily

34

What kind of pathways carry visual info from retina to cortex?

parallel

35

neurons in V1 M pathways are two things:

1. directionally selective
2. dorsal for motion

36

P pathways encode? 2 big ones. Which pathway?

colour and resolution (NOT MOTION)
ventral pathway