Afferent Feedback

Question 1

Where is the primary sensory cortex located?

Answer 1

The anterior parietal cortex (input)

Question 2

What part of the parietal cortex is output?

Answer 2

The posterior parietal cortex

Question 3

Who is Picard?

Answer 3

A scientist that found neurons sensitive to certain stimuli (eg. texture, weight or grip force)

He found that some neurons were sensitive to more than one stimulus

Question 4

What properties of the primary sensory layer and association layer of the cortex lead to phantom limbs?

Answer 4

The primary sensory layer is plastic but the association layer is hard-wired

This means that even though the primary sensory layer has changed, the association layer still has inputs from the removed part of the sensory layer

Question 5

How is proprioception learnt?

Answer 5

The body’s various positions are encoded in neurons in the association cortex of the parietal cortex

Question 6

What are the two pathways of low level visual processing from the retina (in order)?

Answer 6

1. LGN
2. Primary Visual Cortex
3. Dorsal stream to posterior parietal cortex or ventral stream to infero-temporal cortex
4. Superior colliculus
5. Pulvinar nucleus
6. Posterior Parietal cortex

Question 7

Is the macula (central vision, contains fovea) binocular or monocular?

Answer 7

Binocular

Question 8

What are two myths of vision?

Answer 8

1. You don’t see in 3D (it is created in the brain)

2. You don’t see motion (brain creates it in the visual area MT)

Question 9

What visual processing area of the brain processes motion?

Answer 9

MT ( in dorsal stream)

Question 10

What stream of visual processing processes motion?

Answer 10

The dorsal stream processes location and motion