# A quiz on the human visual system

1. Where does the "what" pathway run?

• V2, V3, V4, V5
• V2, V3
• V2, V4

• V2, V5
2. Blue cones are much less responsive than red- and green-sensitive ones. How does the brain handle this?

• The brain amplifies' the blue signal much more than the red and green ones

• There are more blue-sensitive cones in the fovea
• The rods contribute to the blue response too
• Sunlight is much more intense in the blue
3. Why are the decks of ships usually illuminated using red light at night?

• To reduce the amount of light pollution from the ship
• So that only one type of cone is used, leaving the others free for looking out
• So that the dark-adaption of the rods is affected as little as possible

• Because ships may not show any other colour lights
4. What type of cell is responsible for vision in low-light conditions?

• rod

• fovea
• cone
• retina
5. What type of cell is responsible for colour vision?

• rod
• retina
• cone

• fovea
6. Where does the "where" or "how" pathway run?

• V2, V3
• V2, V5

• V2, V3, V4, V5
• V2, V4
7. What is the fovea?'

• The part of the eye that focuses light
• The part of the eye that controls how much light is admitted into the eye
• A depression in the retina which has many more cones than elsewhere on the retina

• Where the optic nerve leaves the eye
8. What is "continuity" in the context of visual processing?

• a derivative exists
• an analogue signal
• filling in missing boundaries

• a continuous stream of pixels
9. Signals from the eye travel via the optic nerve to which of the following?

• visual striate cortex
• V1
• laterate geniculate nucleus

• V4
10. What causes the illusion of the Hermann grid?

• V4
• The inhibitory centre and excitatory surround of the ganglion cells
• V5
• The excitatory centre and inhibitory surround of the ganglion cells

11.