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(a) The three pairs of shapes used in experiment I; all were balanced for dimension and area. (b) The set of ‘distorted’ shapes used in experiments II and III. These are produced by subjecting the symmetrical training stimuli to a transformation that would be produced by a 40° horizontal combined with a 20° vertical rotation of the pattern on a spherical surface viewed from a large distance relative to the diameter of the sphere (according to the algorithm described in appendix A).
