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Left Group detectability functions for the odor of the five carboxylic acids. Each symbol represents the outcome of 630 judgments in the cases of formic and hexanoic acids, 560 judgments in the case of acetic acid, and 490 judgments in the cases of butyric and octanoic acids. Right Plots of group average confidence rating as a function of concentration for each acid. In all cases, bars indicate standard error (SE) of the mean
