Figure 2.

Trial sequence example (Experiment 1). Panel A. Fixed-surfaces condition. Panel B. Shuffled-surfaces condition. On each trial the observer viewed the scene rendered under target illumination (reference interval), followed by two comparison scenes, each rendered under different illumination (comparison intervals). Each stimulus interval was separated by a dark interstimulus interval (ISI). Labels in the diagram indicate the duration of each interval in milliseconds (these were identical across conditions). In both panels the scene shown in the first comparison interval is rendered under the target illumination, while the scene shown in the second comparison interval is rendered under red test illumination (30 ΔE). In the experiment, the order of scenes presented in the two comparison intervals was randomized on each trial. Figure shows left image of the stereo-pair only. Images are tone-mapped for illustration purposes (as described in Radonjić et al., 2016).