Figure 5. Performance of 2D-fit Linear-nonlinear model.

Left column: high red (24%) and low blue (12%) colour contrast. Right column: high blue (24%) and low red (12%) colour contrast. (A) Intensities of red and blue light stimuli (red and blue curves) used in the experiment. (B) 2D-fit LN model (Figure 3D) prediction compared to the output of the chromatic rotation LN model (Figure 3A), and to experimental data. Data was averaged over 20 trials (bin size 33 ms). The 2D-fit LN model output (black line), constructed from a separate data set, follows the data (green line) closely, however the performance of the 2D-fit LN model was similar to the performance of the chromatic rotation LN model (Table 1).