Lecture 13- Visual Cortex- Cell types & Orientation selectivity (TV)

Question 1

Lower/upper visual field is represented in the lower/upper back half of the calcrine sulcus and vice versa

Answer 1

Upper, lower

Question 2

Scotoma

Answer 2

Affects one small area of visual field

Question 3

There are over __ different visual areas beyond V1 in the macaque brain - there is also reasonable degree of functional localisation among these areas

Answer 3

30

Question 4

Human brain has over >___ visual areas in brain

Answer 4

180

Question 5

How are visual areas distinguished from one another?

Answer 5

On the basis of cyto- and myelo- architectonics and physiological studies

Question 6

How is striate cortex (V1) easily identified?

Answer 6

From prominent layer 4b - the stria of Gennari

Question 7

What border represents vertical meridian?

Answer 7

V1/V2 Border

Question 8

What border represents horizontal meridian?

Answer 8

A/B border - at the epicenter

Question 9

Spiny stellate cells are excit/inhib Spineless stellate cells are excit/inhib

Answer 9

Spiny excit (Glut) Spineless inhib (GABA)

Question 10

P cells from LGN project to layers _ and _ with a sparse projection to layer _

Answer 10

4Cbeta, 4A, 6

Question 11

M cells project to _ with a sparse projection to layer _

Answer 11

4Calpha, 6

Question 12

K cells project to layers _ and _

Answer 12

1 and 3 (The supragranular layers - as layer 4 is the granular layer)

Question 13

Hubel and Wiesel discovery?

Answer 13

Cells fire in response to edges

Question 14

Simple cell - Describe receptive field? Best stimulus?

Answer 14

-Small highly elongated receptive field -Best stimulus for this cell is to position a bar of light that covers the cell properly e.g. a bar - using restricted visual stimulus

Question 15

Complex cell - describe receptive field?

Answer 15

-Large square receptive field -Orientation is important but not position