Figure 4.

Left panel: data for one subject (S1) detecting brief changes in the orientation of the adapting grating under three conditions. The conditions are: Red—the task was secondary to carrying out the high-load foveal task of square averaging; Green—the foveal squares were not presented and the orientation task was primary; and Blue—the foveal squares were presented but the subject was instructed to ignore them and make the orientation task primary. Right Panel: Biases (Mu) in the “Blue” low load condition plotted against those in the “Red” High load condition. (See Figure 2 caption for details).