Examples of trials from the relational match-to-sample (RMTS) task. Column 1(farthest left): same trials, with the level of perceptual support set at 90, 78, 66, and 54. The definition of these levels of perceptual support is given in the text. Column 2: different trials, at the same four levels of perceptual support. Column 3: same trials, with the levels of perceptual support set at 42, 30, 18, and 0. Column 4 (farthest right): different trials, at the same four levels of perceptual support. For the figure’s clarity, the same and different choice options, respectively, are always shown to the left and right on the bottom of the screen. These positional assignments actually varied randomly for each trial in the RMTS task.