13 monkeys were trained to discriminate between identical squares of Masonite, 13 in. apart, using cues provided either by variable positions of a pointer or by position relevant signs attached to the pointer. Signs facilitated performance, but the effect did not transfer to the no-sign condition. 10 other monkeys were trained in a similar paradigm bur with a raisin reward rather than a sign attached to the pointer. High levels of performance were attained with the raisin present, but when Ss were tested with the pointer alone their performance was very poor.
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