There is a overall convergence of receptors through bipolar cells on ganglion cells is about 105:1 at retina.however beyond that point divergence is seen ( in the visual cortex the number of neurons concerned with vision is 1000 times the number of fibers in the optic nerves). Does this curtail the information send to cortex and enhance the processing at cortical level ?
Dear Amaranath,
I am sorry, but unfortunately this is not my area of expertise. Maybe the following papers can help you a bit with your question:
Joselevitch C. Human retinal circuitry and physiology. Psychol Neurosci 2008;1(2):141-165. http://www.scielo.br/pdf/pn/v1n2/v1n2a08.pdf
Asari H, Meister M. Divergence of visual channels in the inner retina. Nat Neurosci 2012;15(11):1581-9. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3717330/pdf/nihms488915.pdf
Hoon M, Okawa H, Della Santina L, Wong RO. Functional architecture of the retina: development and disease. Prog Retin Eye Res 2014;42:44-84. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4134977/pdf/nihms-609782.pdf
Cruz-Martín A, El-Danaf RN, Osakada F, Sriram B, Dhande OS, Nguyen PL, Callaway EM, Ghosh A, Huberman AD. A dedicated circuit links direction-selective retinal ganglion cells to the primary visual cortex. Nature 2014;507(7492):358-61. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4143386/pdf/nihms552751.pdf
Neitz J, Neitz M. Evolution of the circuitry for conscious color vision in primates. Eye (Lond) 2017;31(2):286-300. https://www.nature.com/articles/eye2016257.pdf
Have a good research day, Martin
I think convergence at the level of the retina (which occure more in the periphery) leading to summation of the stimulus and so light senstivity is maximum in peripheral retina. But in the visual pathway the flow of impulse is divergent for processing and integration.
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