Central Visual Processing Grover

Question 1

What is a general function of the lateral geniculate nucleus

Answer 1

It is a relay center for visual information to striate and extrastriate visual centers

Question 2

What type of neurons receive input from M type RGC’s and what is their general characteristics

Answer 2

Magnocellular LGN neurons and they have large center receptive fields to response to stimulation with transient spiking (movement)

Question 3

What type of neurons receive input from the P type RGC’s and what is the P type general characteristic

Answer 3

Parvocellular LGN neurons, and they have small center receptive fields and respond with sustained firing (shape)

Question 4

What type of neurons receive information from non-m non p type RGC’s and their characteristics

Answer 4

Intralaminar LGN neurons and they are responsible for color differentiation

Question 5

What is the NT used by the LGN neurons

Answer 5

Glutamate

Question 6

What layer do M type LGN neurons project to

Answer 6

IVC alpha

Question 7

What layer to P type LGN neurons project to

Answer 7

IVC beta

Question 8

What layer do intralaminar LGN neurons project to

Answer 8

Layer III

Question 9

Are Magnocellular LGN neurons monocular or binocular

Answer 9

Monocular

Question 10

What are simple cells

Answer 10

Layer IVC alpha cells have oval shaped on and off zones and are orientation selective. Meaning that they respond best to a stimuli presented in a specific orientation that is aligned with their on zone

Question 11

Describe layer IVB cells

Answer 11

Many are both orientation and direction selective. They fire in response to an object with a specific orientation moving in one direction allowing for the analysis of motion

Question 12

Give the characteristics of P-IB layer III neurons

Answer 12

They are relatively intensive to wavelength and highly orientation selective, they respond to edges, and their receptive fields are small

Question 13

What layer do P-IB III neurons receive their input from

Answer 13

IVC beta

Question 14

Give blob channel neuron characteristics

Answer 14

No orientation selectivity, wavelength responsive and are responsible for detecting color

Question 15

What is a hyper column

Answer 15

A small cube of cortex containing a complete set of orientation Colummns, input from both eyes, and all 3 information processing channels.

Question 16

Lesions of the medial superior temporal gyrus result in what

Answer 16

Impaired perception of motion

Question 17

What is the ventral stream involved in

Answer 17

The analysis of color and form

Question 18

Lesion in the area of V4 of the ventral stream result in what

Answer 18

Achromatopsia- a partial or complete loss of color vision despite functioning cones

Question 19

A lesion in the inferior temporal area of the ventral stream would result in what

Answer 19

Prospagnosia- a deficit in recognizing facial identity

Question 20

What is the critical period of visual development.

Answer 20

A time running through early childhood where children must be visually stimulated to properly develop the visual system neurons