Fourteen pigtailed monkeys were trained to criterion on 2 concurrently presented 4-choice object discriminations. In one problem form was relevant and color constant irrelevant, and in the other color was relevant and form constant irrelevant. Following training, subjects were given transfer tests with a 4-choice setting consisting of the 2 formerly rewarded objects, a third object composed of the rewarded relevant features of the color and form discriminations, and a fourth object constructed from the 2 constant irrelevant color and form features. Subjects consistently chose the previously rewarded objects during transfer, but of the new objects, almost always chose the object constructed of relevant features. A number of models for discrimination learning are considered in light of these data.
Eight rhesus monkeys were trained on a successive discrimination problem with light gray and dark gray stimuli. Following training, generalization tests were given with variable stimuli ranging from white to black. Responses and response latencies were recorded. Responses were faster to the training stimulus values than to middle grays or to the extreme values on the lightness continuum. The theoretical implications of this as compared to other possible findings are developed.
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