The use of an implicit standard for measuring discrimination thresholds
The use of an implicit standard for measuring discrimination thresholds
复制标题
DOI：
10.1016/s0042-6989(00)00093-6
复制
发表时间：
2000-01-01
期刊：
影响因子：
1.8
通讯作者：
McKee, SP
中科院分区：
文献类型：
--
作者：
Morgan, MJ;Watamaniuk, SNJ;McKee, SP
我们使用恒定刺激法（MCS）或单刺激法（MSS）测量用于比较线间分离的阈值。在MCS中，每个试验都有一个明确的标准，而在MSS中，标准是集合的平均值。MSS过程的阈值与MCS过程的阈值几乎相同，无论是否使用反馈。一个统计模型，显示如何阈值误差估计MSS的变化，根据观察员使用的过去的刺激来计算的平均值的集合。如果模型是人类处理过程的准确代表，我们的观察者在过去10-20次试验中平均估计隐含标准。我们的研究结果表明，在MCS过程中的明确的标准通常是多余的。只要测试范围小，并且观察者有一定的实践经验，用MSS程序测得的阈值与用传统MCS程序测得的阈值一样精确。(C)2000爱思唯尔科技有限公司版权所有。
We measured thresholds for comparing the separation between lines, using either the method of constant stimuli (MCS) or the method of single stimuli (MSS). In the MCS an explicit standard is presented on each trial, whereas in the MSS the standard is the mean of the set. The thresholds for the MSS procedure were nearly identical to those with the MCS procedure, whether or not feedback was used. A statistical model is presented showing how the threshold error estimated by MSS varies according to the number of past stimuli used by the observer to calculate the mean of the set. If the model is an accurate representation of human processing, our observers were averaging over the last 10-20 trials to estimate the implicit standard. Our results show that the explicit standard in the MCS procedure is generally superfluous. Provided that the test range is small, and that the observer is given some practice trials, thresholds measured with MSS procedure are just as precise as those measured with the traditional MCS procedure. (C) 2000 Elsevier Science Ltd. All rights reserved.