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Group psychometric odor function (left) and confidence ratings as a function of vapor concentration (right) for each aldehyde. Each point represents the outcome of 560 trials made by 16 subjects for propanal, hexanal, and octanal; 630 trials made by 18 subjects for butanal; and 595 trials made by 17 subjects for nonanal and helional. Bars indicate standard error. Psychometric functions (left) were modeled by the sigmoid equation (2).
