Table 1

Analogies between the properties of the hemi-retinal image and the local organisation of receptive field properties in the supragranular layers. CO blobs are assumed to be the central visual field's representation in the local maps of the supragranular layers.

Global Mapping Local Mapping
oriented lines orientation preference
fovea -> periphery CO blob -> interblob
decreasing ganglion cell density decreasing metabolic activity
decreasing density of colour cones decreasing colour selectivity
decreasing contrast sensitivity high -> low contrast preference
high -> low temporal frequency responsiveness high -> low temporal frequency preference
(= low -> high spatial frequency preference)