physiology of vision

Question 1

what is the direct/vertical pathway for signal transmission?

Answer 1

photoreceptors- biploar cells-ganglion cells

Question 2

what do horizontal cells do?

Answer 2

get input from photoreceptors and project with other photoreceptors and bipolar cells

Question 3

what do amacrine cells do?

Answer 3

get input from bipolar cells and project to ganglion and bipolar cells and other amacrine cells

Question 4

what are the 2 types of photorecptors?

Answer 4

rods and cones

Question 5

when is there more glutamate? in the dark or in the light?

Answer 5

in the dark…

Question 6

hyperpolarization occurs in response to»>?

Answer 6

light

Question 7

rods help seeing in..?

Answer 7

dim light

Question 8

cones help seeing in..?

Answer 8

normal day light

Question 9

more convergence on rods or cones?

Answer 9

rods

Question 10

what deals with colour, rods or cones?

Answer 10

cones

Question 11

what are the differences between rods and cones?

Answer 11

rods- ahcromatic, peripheral retina, high convergence, high light sensitivity, low visual acuity

cones- chromatic, central retina, low convergence, low light sensitivity, high visual acuity

Question 12

where are the first binolcular neurones?

Answer 12

striate cortex

Question 13

what does lateral inhibiton do?

Answer 13

exaggerates the difference in stimulus intensity detetced by adjacent neurones and aids localisation

also modifies the receptive fields of ganglion cells to have centre surround organization. ( ephasizes areas of contrast)

Question 14

what cells deal with lateral inhibition?

Answer 14

horizontal cells and amacrine cells