Grondin S
Ecole de Psychologie, Université Laval, Quebec, Canada.
Percept Psychophys. 2001 Oct;63(7):1214-28. doi: 10.3758/bf03194535.
This article presents the results of three experiments on the discrimination of time intervals presented in sequences marked by brief visual signals. In Experiment 1A (continuous condition), the participants had to indicate whether, in a series of 2-4 intervals marked by 3-5 visual signals, the last interval was shorter or longer than the previous one(s). In Experiment 1B (discontinuous condition), the participants indicated whether, in a presentation of two series of 1-3 intervals, with each series being marked by 2-4 signals, the intervals of the second sequence were shorter or longer than those of the first. Whenever one, two, or three standard intervals were presented, the difference threshold was as high at 150 msec as it was at 300 msec with the continuous method but increased monotonically from 150 to 900 msec with the discontinuous method. With both methods, the increase was well described by Weber's law--the Weber fraction was roughly constant--between 600 and 900 msec (Experiment 2), whereas between 900 and 1,200 msec (Experiment 3), the Weber fraction increased.
本文呈现了三项关于辨别由简短视觉信号标记的序列中时间间隔的实验结果。在实验1A（连续条件）中，参与者必须指出在由3 - 5个视觉信号标记的一系列2 - 4个间隔中，最后一个间隔比前一个间隔短还是长。在实验1B（不连续条件）中，参与者指出在呈现的两个系列的1 - 3个间隔中（每个系列由2 - 4个信号标记），第二个序列的间隔比第一个序列的间隔短还是长。无论呈现一个、两个还是三个标准间隔，连续方法下150毫秒时的差别阈限与300毫秒时一样高，但不连续方法下差别阈限从150毫秒到900毫秒单调增加。两种方法下，在600毫秒到900毫秒之间（实验2），增加情况都很好地符合韦伯定律——韦伯分数大致恒定；而在900毫秒到1200毫秒之间（实验3），韦伯分数增加。
