Abstract
The purpose of this experiment was to test the SPENGE theory of discrimination learning. Eight monkeys were given 112 problems each, 13 trials in length. The 8 th to 13 th trials were reversals of the 1 st to 6 th trials after a single cue on the 7 th trial in one half of the problems. The performance of learning set under a shift from the positive to the negative cue was superior to the shift from the negative to the positive. These trends of the learning set curves in terms of Trial 8 differed from each other. These differences may be interpreted in terms of neither SPENCE theory, nor Uniprocess theory. It was suggested that BIRCH'S interpretation might be appropriate to learning set situation.
