Figure 9.
Offsets of the peak activation of the receptive-field centers and surrounds. Diagram at top shows a contour around the significant regions of activation of the cell shown in Figure 2; peak responses within each subregion are indicated by the dots. An offset of 100% represents one width of the receptive-field center. One green-ON cell and three blue-ON cells had insignificant centers but significant surrounds in at least one of their maps (e.g., cell 5, Fig. 6, S-cone map); these were not included in this analysis. A, Center-surround offset of red–green cells. L map, Average ± SE, 69 ± 4%; M map, average ± SE, 61 ± 4% (not significantly different from L maps, p = 0.23, t test); S map, average ± SE, 84 ± 8% (different from distribution of M at p = 0.06, t test). B, Center-surround offset of blue–yellow cells. L map, Average ± SE, 88 ± 19%; M map, average ± SE, 50 ± 39%; S map, average ± SE, 96 ± 34%.