Vision 2 (L)

Question 1

Saccades - which region of the brain is important for these?

Answer 1

Superior colliculus

Question 2

The mach band illusion is created by

Answer 2

Lateral inhibition

Question 3

The axons of ommatidia are connected by

Answer 3

A lateral inhibitory neural network

Question 4

The _____ of ommatidia are connected by a lateral inhibitory neural network

Answer 4

Axons

Question 5

Herman grid/scintillating grid

When we foveate, the effect disappears, because

Answer 5

Fovea has a different receptive field

Question 6

Lateral inhibition is proportional to

Answer 6

The amount of light

Question 7

How many pathways are there carrying visual information from eye?

Answer 7

3

Question 8

What are the pathways carrying visual information from the eye?

Answer 8

1. Projections to brainstem nuclei (pre-tactal)
2. Superior colliculus
3. Retino-geniculate-striate pathway

Question 9

3 examples of visual reflexes?

Answer 9

Accommodation
Convergence
Pupillary control

Question 10

Retino-tectal projection to the superior colliculus is important for

Answer 10

Orientating head/eyes to/from areas of interest

Question 11

Visual pathways project ___________

Answer 11

Contralaterally

Question 12

Left half of our visual world is processed by

Answer 12

Right hand of brain

Question 13

Visual pathways project contra-laterally

Information crosses over at…

Answer 13

The optic chiasm

Question 14

Where is the optic chiasm located?

Answer 14

Nasal part of retina

Question 15

Superior colliculus contains a ____ of the visual world

Answer 15

Map

Question 16

Superior colliculus

Eye receptors are…

Answer 16

Mapped onto appropriate part of colliculus

Question 17

Sensorimotor properties of the colliculus initiate

Answer 17

Gaze-shifts towards/away from visual events

Question 18

Retino-geniculate-striate pathway simply means…

Answer 18

Retina –> LGN –> striate cortex (PVC)

Question 19

What is the largest/most sophisticated visual pathway

Answer 19

Retino-geniculate-striate pathway

Question 20

The Retino-geniculate-striate pathway takes visual information to the PVC via

Answer 20

The lateral geniculate nuclei

Question 21

Why is retinotopic mapping named so?

Answer 21

Proportion to what is happening on retina

Question 22

Retinotopic mapping

Two stimuli presented to adjacent regions of the retina…

Answer 22

Excite adjacent regions at all levels of system

Question 23

Signals from left visual field reach primary visual cortex via (2)

Answer 23

1. Temporal hemiretina

2. Nasal hemiretina

Question 24

Binocular overlap is important for…

Answer 24

Depth perception

Question 25

Where does information begin to get SEPARATED?

Answer 25

Lateral geniculate nucleus

Question 26

Information begins to get separated at the LGN. Where?

Answer 26

M and P layers

Question 27

P layers are responsive to (5)

Answer 27

``` Colour Fine detail Stationary/slow objects Scene analysis Object identification ```

Question 28

M layers are most responsive to

Answer 28

Luminance change (on, off movement)

Question 29

P layers ___ provides the majority of the input

Answer 29

Cones

Question 30

M layers ____ provides the majority of the input

Answer 30

Rods

Question 31

Receptive fields of primary visual cortex - what kind of cells?

Answer 31

Simple | Complex

Question 32

Neurons are spontaneously active, so influence refers to...

Answer 32

Increasing or decreasing firing rate