Figure 4.

Stimuli were constructed by combining a transparent filter layer, an overlaid surface layer, and an exposed surround layer. (A) Construction of a Static X-junctions geometric configuration. The overlaid layer is cut out from the background, thus creating a continuous surface when replaced, and forming X-junctions on the boundary of the circular region when the filter is placed on the overlaid section. (B) Construction of Static T-junctions geometric configuration is similar to the Static X-junctions, except that the overlaid layer is mirror-reversed, so when it is placed inside the exposed background, and the filter laid on it, T-junctions form on the filter boundary. (C) When the exposed surface in the Static X-junctions is replaced by an achromatic background, while the overlaid layer remains the All Quadrants background, a color inconsistent condition is created. (D) A color inconsistent condition for the Static T-junctions configuration is constructed similarly.