Abstract：
:Central vision is substantially over represented in the lateral geniculate nucleus (dLGN) and striate cortex. The over representation could be accompanied by a selective expansion of central vision in parvocellular dLGN, in which case the ratio of parvocellular to magnocellular inputs to striate cortex should change with retinal eccentricity. To test this, sample ratios were determined from counts of neurons in dLGN labelled retrogradely with WGA-HRP from striate cortex at the cortical representations of various eccentricities. Parvocellular to magnocellular ratios decreased from a mean of 35:1 at the fovea to 5:1 at 15 degrees eccentricity. Furthermore, they exceeded the ratio of P beta to P alpha ganglion cells in central retina, but not in peripheral retina, showing that the uneven P to M ratio in the LGN does not merely mirror the distribution of ganglion cells in the retina. This provides direct evidence for selective over representation of central vision in parvocellular dLGN.
journal_name
Vision Resjournal_title
Vision researchauthors
Azzopardi P,Jones KE,Cowey Adoi
10.1016/s0042-6989(98)00319-8subject
Has Abstractpub_date
1999-06-01 00:00:00pages
2179-89issue
13eissn
0042-6989issn
1878-5646pii
S0042-6989(98)00319-8journal_volume
39pub_type
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