Local mapping of the hemi-retinal image into the supragranular layers of the primary visual cortex. This mapping is given in equation 5, n=1. Left of figure shows the hemi-retinal field which is mapped to the supragranular layers, shown at right of figure. The distortion of the hemi-retinal image is shown by black lines. The point f, where the converging black lines meet, is the fovea and has the z coordinates (0,0). The mapping is local, that is, it tiles the area of V1 with multiple small copies of the z-plane. The mapping of a set of oriented lines is shown by coloured lines. Moving bars are represented the same as in digram 2, save that the speed of the moving bar has to be appropriate for the transmission delays within 4A and 4B in order for the local map representation to form (see section 5 of text).