extradimensional shift

In “extradimensional” shift, the relevant dimension is changed (e.g., from GEK = GREEN to GEK = TRIANGLE), but the classification of some objects does not change (GREEN TRIANGLE is a GEK under both rules). The relative ease with which subjects handle such problems suggests something about…

…ages execute reversal and so-called extradimensional shifts. In performing both kinds of shift, experimental subjects learn two successive discriminations between two pairs of objects that vary simultaneously in two aspects or dimensions—e.g., white triangle versus black square, and black triangle versus white square. In training subjects initially, discrimination of only…