Figure 3.

Measurements with the surround modulation at 0.025 Michelson contrast. Each column shows results for one observer. The three rows show measurements for the three temporal frequencies. In each panel, the perceived modulation depth is plotted on the vertical axis, and the center–surround phase difference is on the horizontal axis. Monocular results are shown by red circles and dichoptic results by green circles. The blue square shows the perceived modulation depth with a steady surround. Lines through the plotted points are fits of the model in Equation 1 (see text). Error bars indicate one standard error of the mean.