Figure 2. Irregular RF Shapes Were Coordinated in Large Populations of on and off Midget and Parasol Cells.

The simultaneously recorded RFs of each cell type formed a regularly spaced mosaic, represented here as a collection of contour lines. The contour level was the same for all cells in each mosaic, and was chosen so that neighboring contours, on average, just touched (see Materials and Methods). The width of each panel represents approximately 2.2 mm on the retina.

(A) RFs of 88 simultaneously recorded on parasol cells from 9 mm eccentricity (temporal retina). Cells marked with a dot are those shown in Figure 1.

(B) RFs of 117 simultaneously recorded off parasol cells from the same preparation as in (A).

(C) RFs of 179 simultaneously recorded on midget cells from 8 mm eccentricity (superior retina).

(D) RFs of 141 simultaneously recorded off midget cells from 11.5 mm eccentricity (superior-nasal retina).