Fig 3. Graphic depiction of the overall results of all three experiments. The graph includes Tests 1, 2, 3, and 4, and receptive symmetry training in Experiment 1: Squares (with time delay) depict naming tests; circles (with time delay) depict receptive symmetry tests (correct or incorrect). Also included are data from tests for visual–visual symmetry (BA/CB) and transitivity/equivalence (AC/CA) in Experiments 2 and 3: Triangles depict 100 % correct responses on all tests.