Visual Retinal Processing

Question 1

receptive field

Answer 1

the region of a sensory surface that, when stimulated, changes the membrane potential of a neuron (the neuron doesn’t have to be physically close to the sensory surface) peripheral cells have a lot of convergence so their receptive fields are larger than cells in the fovea

Question 2

bipolar cells

Answer 2

do not fire action potentials, two types: OFF- depolarize in response to dark, express AMPA receptors, synapse onto OFF ganglion cells. ON- depolarize in response to light, express metabatropic glutamate receptors (mGluR) that closes a cation channel, synapse onto ON ganglion cells

Question 3

Answer 3

Question 4

biopolar cells’ receptive fields

Answer 4

center-surround: always have oppostie responses to the same stimuli

center: direct input from photoreceptors to bipolar cells
surround: indirect input to biploar cells from photoreceptors via horizontal cell

Question 5

horizontal cells

Answer 5

inhibit photoreceptors in the center of receptive field

Question 6

depolarization for OFF bipolar cells

Answer 6

Question 7

depolarization for ON bipolar cells

Answer 7

Question 8

retinal ganglion cells

Answer 8

have action potentials, center-surround receptive fields

Question 9

OFF retinal ganglion cell response to edges

Answer 9

Question 10

color- opponent ganglion cells

Answer 10

red-green

blue-yellow