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Fig. 3. Performance of three squirrel monkeys in discriminating between various
dilutions of a given odorant and the odourless solvent. Each data point
represents the percentage of correct choices from at least 30 decisions. The
three different symbols represent data from each of the three individual
animals tested. Filled symbols indicate dilutions that were not discriminated
significantly above the chance level (binomial test, P>0.05;
chance level shown by dashed line).