Baker R J, Rosen S
Centre for Human Communication and Deafness, The University of Manchestre, UK.
Br J Audiol. 2001 Feb;35(1):43-52. doi: 10.1080/03005364.2001.11742730.
There has been much recent interest in the use of adaptive psychophysical procedures based on maximum-likelihood estimation (MLE) in order to minimize testing time. The speed and accuracy of MLE was compared to a standard transformed up-down algorithm in a two-interval forced-choice task. Thresholds for detecting a 2 kHz tone in either a broadband or a notched-noise were estimated in three normal-hearing listeners. The transformed up-down algorithm tracked 79% correct with either two, four, six or eight final turnarounds, whereas the MLE procedure tracked 70%, 80% or 90% correct. MLE was always quickest, but with a penalty in increased variability. Use of the MLE procedure to track 70% or 80% correct also resulted in a tendency to overestimate listeners' sensitivity. Reducing the number of turnarounds in the up-down procedure from eight to two reduced the number of trials required by nearly half and resulted in thresholds with similar magnitude and variability to those obtained using MLE to track 90% correct.
最近，人们对基于最大似然估计（MLE）的自适应心理物理学程序的使用兴趣浓厚，目的是尽量减少测试时间。在双间隔强迫选择任务中，将MLE的速度和准确性与标准的转换上下算法进行了比较。在三名听力正常的受试者中，估计了在宽带噪声或带陷噪声中检测2kHz音调的阈值。转换上下算法在进行两、四、六或八次最终反转时，跟踪正确率为79%，而MLE程序的跟踪正确率为70%、80%或90%。MLE总是最快的，但代价是变异性增加。使用MLE程序跟踪70%或80%的正确率也会导致高估受试者的敏感度。将上下程序中的反转次数从八次减少到两次，所需试验次数减少了近一半，并且得到的阈值在大小和变异性上与使用MLE跟踪90%正确率时获得的阈值相似。
