Central Processing Flashcards
what is binocularity
some ganglion cells project to the same side, some to opposite sides
what is the LGN
thalamic nucleus through which visual information is routed to the visual cortex
what is anatomy of the LGN
ladder structure with 6 layers largest cells (m cells) in layers 1 and 2
describe projection in LGN
visual info from the two visual fields is kept separate
what is ipsilateral and contralateral projection
in right LGN, right eye axons synapse on LGN layers 2,3,5
left eye axons synapse on layers 1,4,6
what is the retinotopic map of visual cortex
retina
LGN
striate cortex (layer IVC)
where do signals coming from LGN project to
visual cortex V1(area 17/striate cortex)
what are two cell types of LGN
stelate cells (very small, not proper axons, in layer C4) pyramidial cells (structure that radiate through cortex, only cells with axons that exit cortex)
what are three parallel processing channels
m channel
p-ib channel
blob channel
what is m channel
magnocellular
analyses object motion
simple cells that are orientation sensitive
what are P-Ib channel
parvocellular interblob
layer 3 analyses object shape
receive binocular inputs
what are blob cells
parvo and koniocellular
object colour
wavelength sensitive