Hall J L
J Acoust Soc Am. 1983 Feb;73(2):663-7. doi: 10.1121/1.388958.
In adaptive psychophysical testing, it is desirable to identify experimental runs during which the subject's threshold changes. This is not easy to do, because the testing level changes during the course of the run. The following screening procedure can assist in detecting threshold variability. At the conclusion of the run, determine for each trial the discrepancy between observed and expected response. Next, determine the linear regression of this discrepancy upon trial number. If the subject's response behavior is stable and well described by the psychometric function, then the expected value of slope of the linear regression is equal to zero. If the observed slope differs greatly from zero, then it is unlikely that the subject's response behavior is stable. Results from computer simulations and psychophysical experiments are presented.
在适应性心理物理学测试中，识别出受试者阈值发生变化的实验运行阶段是很有必要的。这并非易事，因为在运行过程中测试水平会发生变化。以下筛选程序有助于检测阈值变异性。在运行结束时，针对每个试验确定观察到的反应与预期反应之间的差异。接下来，确定该差异关于试验次数的线性回归。如果受试者的反应行为稳定且能用心理测量函数很好地描述，那么线性回归斜率的期望值等于零。如果观察到的斜率与零有很大差异，那么受试者的反应行为不太可能是稳定的。文中给出了计算机模拟和心理物理学实验的结果。
