Dai H
Department of Psychology, University of Florida, Gainesville 32611, USA.
J Acoust Soc Am. 1995 Dec;98(6):3135-9. doi: 10.1121/1.413802.
Psychometric functions were obtained using the conventional constant-stimulus method and an adaptive up-down method, for both computer-simulated and human observers. Except when the stimuli are closely placed, psychometric functions obtained with the adaptive method are as accurate as those obtained with the constant-stimulus method. Empirically, the adaptive method has some potential advantages owing to its ability to automatically concentrate the trials within the dynamic range of the psychometric function. It needs no pilot measurements for setting the signals as required by the constant-stimulus method. Furthermore, following a marked change in the underlying psychometric function, the distribution of the trials is automatically readjusted. Thus, on the basis of empirical considerations, the adaptive method is a better choice than the constant-stimulus method for measuring psychometric functions.
针对计算机模拟观察者和人类观察者，使用传统的恒定刺激法和自适应升降法获得了心理测量函数。除了刺激间隔很近的情况外，用自适应法获得的心理测量函数与用恒定刺激法获得的函数一样准确。从经验上看，自适应法具有一些潜在优势，因为它能够自动将试验集中在心理测量函数的动态范围内。它不需要像恒定刺激法那样进行预试验测量来设置信号。此外，在潜在的心理测量函数发生显著变化后，试验分布会自动重新调整。因此，基于经验考虑，在测量心理测量函数时，自适应法比恒定刺激法是更好的选择。
