Lecture 3 - From LGN to Cortex

Question 1

(lecture):

Describe the anatomy of the early visual system.

Answer 1

(lecture):

See pink writing on page 1 of G doc notes.

Question 2

(lecture):

Describe the physiology of the LGN.

Answer 2

(lecture):

See green writing on page 1 of G doc notes.

Question 3

(lecture):

Describe the function of the LGN.

Answer 3

(lecture):

See green writing on page 2 of G doc notes.

Question 4

(lecture):

What are the consequences of of Cortical Magnification?

Answer 4

(lecture):

See orange writing on page 2 of G doc notes.

Question 5

(lecture):

Describe the receptive fields in V1.

Answer 5

(lecture):

See purple writing on page 3 of G doc notes.

Question 6

(lecture):

Describe Orientation Tuning (and Size Tuning) in receptive fields.

Answer 6

(lecture):

See purple writing on page 4 of G doc notes.

Question 7

(lecture):

Describe Feature receptors and population codes

Answer 7

(lecture):

See purple writing on page 4 of G doc notes.

Question 8

(lecture):

Describe Simple Cells, Complex Cells, and Hypercomplex Cells

Answer 8

(lecture):

See purple writing on page 5 of G doc notes.

Question 9

(lecture):

Possible Essay Questions:

1) Describe and discuss the perceptual consequences of cortical magnification.
2) Using the example of orientation, discuss the role of population codes in visual perception.

Answer 9

(lecture):

Question 10

(lecture):

Lecture outline:

• Lateral geniculate nucleus
• Primary visual cortex
• Cortical information processing and how it builds on retinal and thalamic output

Key concepts:

• Distinct pathways
• Retinotopy and cortical magnification •Receptive fields of V1 neurons
• Population code

Answer 10

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