Rods – have a high sensitivity to low levels of brightness – no rods in the fovea (around) Cones – three cone types allow for the perception of color – Most cones are concentrated in and around the fovea (center)
Retina Ganglion Cells and LGN the information from the two eyes remains still entirely separate in six different neuronal layers there is even almost a one-to-one correspondence between retinal ganglion and LGN cells In motion analysis, LGN ganglion cells have lower optimal temporal frequencies
Single-opponent cells Single-opponent cells are color sensitive and compute color differences – namely L-M (L for long wavelength and M for middle wavelength, symbol “-” stands for oppo- nency) and S- (L+M) (S stands for short wavelength), thereby establishing the red-green and the blue-yellow color axes. These cells are parvocellular (P) neurons and are somewhat slower but have smaller receptive fields, i.e. higher spatial resolutions, than the magnocellular neurons.