INTRADIMENSIONAL AND EXTRADIMENSIONAL SHIFT LEARNING BY PIGEONS

Pigeons were trained consecutively on two simultaneous visual discriminations. For half the Ss, the dimension relevant in the first problem remained relevant in the second (intradimensional shift); for the remainder, the dimension irrelevant in the first problem became relevant in the second (extradimensional shift). As is predicted by two-stage theories of discrimination learning, the intradimensional shift was learned more rapidly than the extradimensional shift. © 1969, Psychonomic Journals, Inc.. All rights reserved.