Figure 3.

Schematic of a model layer 4Cα hypercolumn (Left), with axonal (gray circle) and dendritic (dark circle) arbor widths indicated for excitatory (E) and inhibitory (I) cells. The neuron along the ray at angle 2θ (emanating from the pinwheel center) in the cortex inherits its orientation preference on the basis of convergent input from a distribution of ON/OFF cells (Upper Right). The distribution's orientation at angle θ in the visual field sets the orientation preference. In this inset, the OFF cells are indicated by filled circles. The Lower Right graph shows the LGN temporal kernel G.