Comparison of ROC and AFC methods in a visual detection task

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Abstract
The visual observer performance for detecting low‐contrast patterns by employing both the receiver operating characteristic (ROC) and the 9‐alternative forced choice (9‐AFC) method is investigated. For each observer and each experimental technique, the results were reproducible with respect to a repeated observation. When the results of different observers for each method are compared, a strong variation of values is found. From the ROC data obtained, the expected percentages of correct detection in a 9‐AFC experiment is calculated and compared with the corresponding values of the actual 9‐AFC experiment. For some observers, the latter values were significantly higher than the computed ones, whereas for others the results showed good agreement with predictions from theory.

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