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Fig. 4. Performance of three pigtail macaques in discriminating between various
dilutions of a given odorant and the odourless solvent. Each data point
represents the percentage of correct choices from 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 broken line).