Striate Cortex

Question 1

Thickness of grey matter

Answer 1

4mm

Question 2

Cortical surface area

Answer 2

2200 cm2

Question 3

How many neurons in cortex?

Answer 3

10^10

Question 4

How many synapses in cortex

Answer 4

10^15

Question 5

Retinotopically organzied

Answer 5

Neighboring parts of the visual field are processed by neighboring cells in the cortex

Question 6

Cortical magnification factor

Answer 6

Large proportion of striate cortical neurons devoted to analysis of foveal vision

Question 7

Extrastriate

Answer 7

All visually resonsive areas that do not recevie information from LGN

Question 8

What do neurons in the striate cortex respond best to?

Answer 8

Lines, edges, or bars

Question 9

Simple cells respond best to

Answer 9

Elongated stimuli

Question 10

What shape are receptive fields of simple cells

Answer 10

Rectangular

Question 11

2 requirements for excitation of simple cells

Answer 11

Specific orientation

Proper positioning

Question 12

Hierarchical processing

Answer 12

Building of more complex RF configurations from simpler RF configurations

Question 13

Where is the stimulus positioned for complex cells?

Answer 13

Anywhere withing the receptive field

Question 14

T/F Complex cells respond to stationary bars

Answer 14

False, motion sensitive

Question 15

Directional sensitivity

Answer 15

Complex cells respond best to bar moving in a specific direction

Question 16

What is the importance of microsaccades?

Answer 16

Keep the retinal image from fading

Question 17

How can you increase the response of the cell?

Answer 17

By increasing the length of the stimulus to a certain point

Question 18

Hypercomplex cells

Answer 18

Show an increase in response with an increase in stimulus length until the stimulus exceed the critical limit, when the response begins to decrease

Question 19

Stereopsis

Answer 19

Innate binocular sensation of depth

Question 20

What 2 things does binoculalrity allow for?

Answer 20

Stereopsis and a larger field of vision

Question 21

Where are the first binocular neurons located?

Answer 21

Outside of layer 4 in the striate cortex

Question 22

Ocular dominance columns

Answer 22

Neurons driven predominantely be each eye are grouped together runnng perpendicular to the cortical surface

Question 23

Orientation columns

Answer 23

Neurons most responsive to a specific orentiation grouped in functional columns

Question 24

Hypercolumn

Answer 24

Most basic unit of the cortex comprising of a full complement of ocular dominance columns and orientation columns that respresents a specific point in the visual field

Question 25

What 3 things do hypercolumns extract from visual information?

Answer 25

Depth, orientation, and color

Question 26

What kind of pathway is the ventral stream?

Answer 26

What pathway, gives detail, color, and form information

Question 27

What type of pathway is the dorsal stream?

Answer 27

Where pathway, gives information on where the object is located

Question 28

Blobs

Answer 28

Surplus of neurons with color opponent receptive fields

Question 29

Thin stripes are P or M?

Answer 29

Parvo

Question 30

Pale stripes are P or M

Answer 30

Parvo

Question 31

Thick stripes are P or M?

Answer 31

magno

Question 32

Cortically blind

Answer 32

Complete damage to V1

Question 33

Blindsight

Answer 33

A phenomenon in which a patient who is cortically blind from a lesion in area V1, can seemingly perceive light

Question 34

What type of experiment proves blindsight?

Answer 34

Two-alternative forced choice

Question 35

What is a theory that explains blindsight?

Answer 35

Some optic nerve axons bypass the LGN and project to other areas

Question 36

Where must information go in order to be conscious visual perception?

Answer 36

LGN and V1