Parallel Processing

Question 1

When does the segregation between layers begin?

Answer 1

Ganglion cell layer

Question 2

What input do the four dorsal LGN layers receive?

Answer 2

Midget parvocellular ganglion cells

Question 3

What input do the two ventral LGN layers receive?

Answer 3

Parasol magnocellular ganglion cells

Question 4

What layers send to layer IV-c beta?

Answer 4

Parvocellular

Question 5

What layers send to IV-C alpha?

Answer 5

Magnocellular

Question 6

Dorsal stream

Answer 6

Contains magnocellular input and is destined for the posterior parietal cortex

Question 7

Ventral stream

Answer 7

Contains parvocellular input and is destined for the inferior temporal cortex

Question 8

Which cells transmit a red-green color opponent signal

Answer 8

Midget ganglion cells

Question 9

Which cells are sensitive to high spatial and low temporal frequencies

Answer 9

Midget ganglion cells

Question 10

Which g cells have smaller receptive fields

Answer 10

Midget ganglion cells

Question 11

Which cells have smaller cell bodies and dendritic trees

Answer 11

Midget ganglion cells

Question 12

Which cells have a slower axonal conduction

Answer 12

Midget ganglion cells

Question 13

Which cells synapse in 6, 5, 4, and 3 in the LGN

Answer 13

Midget ganglion cells

Question 14

Which cells make up 10% of the ganglion cell population

Answer 14

Parasol ganglion cells

Question 15

Which cells transmit an achromatic signal

Answer 15

Parasol ganglion cells

Question 16

Which cells are sensitive to low spatial, high temporal frequencies and motion

Answer 16

Parasol ganglion cells

Question 17

Which cells have the largest receptive field

Answer 17

Parasol ganglion cells

Question 18

Which cells have larger cell bodies and large dendritic trees

Answer 18

Parasol ganglion cells

Question 19

Which cells have faster axonal conduction

Answer 19

Parasol ganglion cells

Question 20

Which cells synapse in layers 1 and 2 of the LGN

Answer 20

Parasol ganglion cells

Question 21

Which cells comprise of 8% of the ganglion cell population

Answer 21

Bistratified ganglion cells

Question 22

Which cells transmit a blue yellow color opponent signal

Answer 22

Bistratified ganglion cells

Question 23

Which cells synapse in the interlaminar regions of the LGN

Answer 23

Bistratified ganglion cells

Question 24

Spatial frequency

Answer 24

Level of detail contained per degree of visual light, measured in cycles/degree

Question 25

Transient response

Answer 25

a response is shown only during stimulus abrupt on and off

Question 26

Linear response

Answer 26

Total response of the cell is the sum of its response to the sub-parts of the stimulus

Question 27

Null position

Answer 27

When the grating is placed such that half the light stripe falls on the center and the other half on the surround to get a neutralized response

Question 28

Lesion in what region would cause reduced sensitivity to contrast at high spatial frequencies?

Answer 28

Dorsal layers, parvocellular system

Question 29

Lesion in what region would cause reduced wavelength-based discriminations with color perception?

Answer 29

Dorsal layers, parvocellular system

Question 30

Lesion in what region would cause reduced sensitivity to contrast at low spatial frequencies

Answer 30

Ventral layers, magnocellular

Question 31

Lesion in what region would cause severe reduction in detection of high temporal frequency flicker?

Answer 31

Ventral layers, magnocellular syystem

Question 32

Lesion in what region would leave color vision in tact?

Answer 32

Ventral layers, magnocellular system

Question 33

Isoluminant gratings

Answer 33

Isolates the magnocellular and parvocellular layers with alternate bars of different chromaticities of the same luminance

Question 34

Which system detects isoluminance

Answer 34

Parvocellular

Question 35

Chromaticity

Answer 35

Combination of hue and saturation

Question 36

Primary open angle glaucoma

Answer 36

Chronic progressive optic neuropathy typically associated with an elevation in IOP

Question 37

Perimetric tests

Answer 37

Measures relative sensitivity of peripheral vision

Question 38

Which neurons are affected first in glaucoma?

Answer 38

Magnocellular neurons (larger axons)

Question 39

What stimulus is used in frequency doubling perimetry?

Answer 39

Low spatial frequency, high temporal frequency, with a rate of flicker of 15Hz