Performances of Rhesus Monkeys on Two-Cue Problems with Cues Separated.
ARMY MEDICAL RESEARCH LAB FORT KNOX KY
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Relative performance on color and form dimensions during acquisition of two-cue problems by learning-set sophisticated rhesus monkeys was evaluated with differential reinforcement. Six animals received 24 two-choice problems, each generated from three planometric stimuli a reference stimulus, an alternate stimulus identical in color but differing in form, and one identical in form but differing in color. The reference stimulus appeared on every trial of a problem and was paired with one or the other alternate on a given trial. On half of the problems, the reference stimulus was positive and on the remainder negative. Acquisition was nearly equivalent on both cue dimensions with positive reference stimuli, but only one dimension was learned with negative reference stimuli. Results were interpreted as unfavorable to attention theory. Author