Herrmann C, Buhr E, Hoeschen D, Fan S Y
Physikalisch-Technische Bundesanstalt, Braunschweig, Federal Republic of Germany.
Med Phys. 1993 May-Jun;20(3):805-11. doi: 10.1118/1.596986.
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.
研究了通过使用接收器操作特性（ROC）和9项迫选法（9-AFC）来检测低对比度图案时视觉观察者的表现。对于每个观察者和每种实验技术，重复观察的结果具有可重复性。当比较每种方法不同观察者的结果时，发现值有很大差异。根据获得的ROC数据，计算9-AFC实验中预期的正确检测百分比，并与实际9-AFC实验的相应值进行比较。对于一些观察者，后者的值显著高于计算值，而对于其他观察者，结果与理论预测显示出良好的一致性。
