FURTHER-STUDIES OF A MAXIMUM-LIKELIHOOD YES-NO PROCEDURE
FURTHER-STUDIES OF A MAXIMUM-LIKELIHOOD YES-NO PROCEDURE
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DOI：
10.1121/1.410378
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发表时间：
1994-07-01
影响因子：
2.4
通讯作者：
GREEN, DM
中科院分区：
文献类型：
--
作者：
GU, X;GREEN, DM
使用最大似然“是 - 否”程序和传统的“三降一升”强制选择自适应程序，对500、1000和2000赫兹的纯音估计绝对阈值。通过这两种程序获得的阈值估计值高度相关。在最大似然“是 - 否”程序中，误报概率估计不准确。对该程序进行一个简单的改变，就能对误报率产生偏差更小的估计值。在第二个实验中，研究了误报率对阈值估计的影响。当听者采用宽松或保守的标准来检测信号时，对其绝对阈值进行估计。使用恒定刺激“是 - 否”程序和最大似然“是 - 否”程序收集数据。低误报率的阈值估计比高误报率高5到6分贝。基于刺激功率模型的心理测量函数对用恒定刺激法获得的数据拟合最佳。该刺激功率模型被用于在最大似然“是 - 否”程序中生成假定的心理测量函数。进行计算机模拟以确定听者的不专注，或者听者的心理测量函数的斜率参数与最大似然程序中假定的斜率参数不匹配，如何影响阈值估计。
Absolute thresholds were estimated for pure tones of 500, 1000, and 2000 Hz using both a maximum-likelihood yes-no procedure and a traditional three-down one-up forced-choice adaptive procedure. Threshold estimates obtained with the two procedures were highly correlated. In the maximum-likelihood yes-no procedure, the false-alarm probability was poorly estimated. A simple change in that procedure produced less-biased estimates of the false-alarm rate. In a second experiment, the influence of the false-alarm rate on the threshold estimates was investigated. The listeners' absolute thresholds were estimated when they adopted either a liberal or conservative criterion for detecting the signals. Data were collected using both a constant-stimulus yes-no procedure and a maximum-likelihood yes-no procedure. Threshold estimates are 5 to 6 dB higher for the low than for the high false-alarm rates. Psychometric functions based on a stimulus-power model provided the best fit to the data obtained with the constant-stimulus method. This stimulus-power model was used to produce the assumed psychometric function in the maximum-likelihood yes-no procedure. Computer simulations were conducted to determine how threshold estimates were affected by the listener's inattention or by mismatches between the slope parameter of the listener's psychometric function and that assumed in the maximum-likelihood procedure.