Organization of the Primary Visual Cortex

Question 1

TRUE or FALSE: there is a retinotopic map in the primary visual cortex

Answer 1

TRUE

Question 2

TRUE or FALSE: adjacent points in the visual field are represented by adjacent neurons in V1

Answer 2

TRUE

Question 3

label the retinotpic map

Answer 3

slide 2

Question 4

TRUE or FALSE: neurons that are tangent to the surface of the cortex correspond with the same visual preference

Answer 4

FALSE: neurons that are perpendicular

Question 5

TRUE or FALSE: the fovea takes up a really small area on the retinotopic map

Answer 5

FALSE: fovea is MAGNIFIED on the retinotopic map

Question 6

What percentage of the retina does the fovea account for?

Answer 6

0.01%

Question 7

What percentage of the visual cortex do signals from the fovea account for?

Answer 7

8-10%

Question 8

TRUE or FALSE: cells in the left visual cortex are ipsilateral dominant.

Answer 8

FALSE: right visual cortex

Question 9

Draw the ice tray model for the functional organization of V1.

Answer 9

slide 9
- 2 ocular dominance columns (left and right)
- colour blobs
- bar orientation preference
- 1mm x 1mm

Question 10

TRUE or FALSE: all species have pinwheel orientation columns

Answer 10

FALSE: animals with PHOBIA have pinwheel orientation columns

Question 11

Draw a pinwheel orientation column.

Answer 11

slide 10

Question 12

WHat do horizontal connections connect? What is the fucntion?

Answer 12

• connect neurons with the same preference but across different areas of the cortex
• function: bind areas of an image that are similarly oriented