vision

Question 1

what is the process of an image passing through to the primary visual cortex?

Answer 1

LIGHT -> RETINA [photosensitive ganglion cells] -> OPTIC NERVE AXONS -> OPTIC CHIASM [cross over] -> LATERAL GENICULATE NUCLEUS -> PRIMARY VISUAL CORTEX

Question 2

why does v1 receive a distorted image

Answer 2

the fovea is over represented in terms of photoreceptors, so central vision is much more detailed

Question 3

what do photosensitive ganglion cells converge to make

Answer 3

the optic nerve

Question 4

what did hubel and wiesel find in their animal experiments

Answer 4

retinal ganglion cells were stimulated by defined edges === each photoreceptor is stimulated by a specific part of the visual field

Question 5

how does the receptive field of a retinal ganglion cell work

Answer 5

excitatory when light falls on it, inhibitory when light falls on the surrounding cells [works by detecting changes = LATERAL INHIBITION]

Question 6

what do rods/cones detect

Answer 6

cones = colour
rods = low light

Question 7

what is the colour-opponent system

Answer 7

pairs of visual neurons work in opposition, viewing one colour may fatigue those neurons, and the opposite colour will be emphasised on a blank background