# A quiz on the human visual system

1. What type of cell is responsible for colour vision?

• cone

• retina
• fovea
• rod
2. What causes the illusion of the Hermann grid?

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

3. Roughly, what is the range of wavelengths of visible light?

• 0--100 nm
• 100--1000 nm
• 400--700 nm

• 1000--5000 nm
4. What is the fovea?'

• A depression in the retina which has many more cones than elsewhere on the retina

• The part of the eye that focuses light
• The part of the eye that controls how much light is admitted into the eye
• Where the optic nerve leaves the eye
5. Blue cones are much less responsive than red- and green-sensitive ones. How does the brain handle this?

• There are more blue-sensitive cones in the fovea
• Sunlight is much more intense in the blue
• The rods contribute to the blue response too
• The brain amplifies' the blue signal much more than the red and green ones

6. What is the name of the rear surface of the eye?

• cornea
• fovea
• retina

• optic nerve
7. What type of cell is responsible for vision in low-light conditions?

• fovea
• cone
• rod

• retina
8. Where does the "what" pathway run?

• V2, V4

• V2, V3
• V2, V5
• V2, V3, V4, V5
9. To which of the following do the cells in V1 respond to?

• orientation, edge
• orientation, edge, motion

• motion
• edge, motion
10. Signals from the eye travel via the optic nerve to which of the following?

• laterate geniculate nucleus

• visual striate cortex
• V4
• V1
11.