Lam C F, Mills J H, Dubno J R
Department of Biometry and Epidemiology, Medical University of South Carolina, Charleston 29425-2503, USA.
J Acoust Soc Am. 1996 Jun;99(6):3689-93. doi: 10.1121/1.414966.
Psychometric functions for different psychophysical tasks describe the relationship between physical stimuli and subjects' responses. Although a psychometric function is of considerable value, characterizing the function is time consuming and, hence, is not carried out routinely in psychophysical experiments. A principal reason for the lack of efficiency in characterizing the psychometric function is the use of unimodal (e.g., Gaussian and uniform) sampling methods. As an alternative, a multimodal four-point sampling method is proposed. A psychometric function is then fitted to the four data points (each with several trials) to estimate the threshold and slope parameters of the psychometric function. Results from three examples demonstrate that a 60% savings in data-collection time can be achieved.
不同心理物理学任务的心理测量函数描述了物理刺激与受试者反应之间的关系。尽管心理测量函数具有相当大的价值，但对该函数进行特征描述耗时且因此在心理物理学实验中并非常规操作。在对心理测量函数进行特征描述时缺乏效率的一个主要原因是使用了单峰（例如高斯和均匀）抽样方法。作为替代方案，提出了一种多峰四点抽样方法。然后将心理测量函数拟合到四个数据点（每个数据点有多次试验）以估计心理测量函数的阈值和斜率参数。三个示例的结果表明，可以节省60%的数据收集时间。
