vision 2

cone system has what relationship with bipolar cells

one to one --> needs to activate one cell to activate cone

visual system operates over

a large range of luminance values

what is in scoptopic and what kind of vision

rods only, really low light

what do scotopic respond to

single photons

what is mesopic and what is it mediated by

starlight and moonlight, both rods and cones

what happens in mesopic

closer to top --> increase rod saturation

what is photopic and mediated by

day vision, only cones

where is good color vision

photopic!

what would happen if cone function was lost

legally blind! no color, no high spatial

what would happen if rod function was lost

lose peripheral vision, no low light vision

cone receptors mediate what

color vision

what does it mean for human vision to be trichromatic

3 different color channels to interpret light

what is protanopia

loss long-wavelength cones --> no red

What is deuteranopia?

loss of medium wavelength sensitive cones --> still no red

most mammals have what kind of vision

dichromatic - 2 cones (short and medium)

what other animals are trichromatic and why

monkeys and apes --> look for berries and things in forest

can cone receptors be activated by the same colors

yes!

how are colors distinguished

compare activity level in cones -- some RGC and LGC are sensitive

color opponent

Ganglion cells sensitive to differences in the wavelength of light

what affects people's assumption about the illumination

exposure to daylight

larva zebrafish has what kind of vision

above water = dichromatic, under water - tetrachromatic