Laflamme Vincent, Zakay Dan, Gamache Pierre-Luc, Grondin Simon
École de psychologie, Université Laval, 2325 rue des Bibliothèques, Québec, QC, Canada, G1V 0A6,
Atten Percept Psychophys. 2015 Jul;77(5):1507-14. doi: 10.3758/s13414-015-0937-y.
One factor influencing the perceived duration of a brief interval is the length of the period preceding it, namely the foreperiod (FP). When multiple FPs are varied randomly within a testing session, longer FPs result in longer perceived duration. The purpose of this study was to identify what characteristics modulate this effect. In a task where participants were asked to categorize the duration of target intervals with respect to a 100-ms standard, the FPs were distributed over a 150-, 300-, or 900-ms range with the midpoint (1000 ms) of these distributions being kept constant. The results indicate that the effect of the length of variable FPs on perceived duration was much stronger in the 900-ms range condition. More specifically, this effect is due to the differences between the shortest FPs. The results also reveal that, overall, there are more short responses in the 300-ms condition than in the other range conditions. Moreover, the data reveal that the narrower the distribution, the better the discrimination. One interpretation of the main result (range effect) is that a wider distribution leads to an increased prior uncertainty towards the foreperiod length.
影响对短暂间隔的感知时长的一个因素是其之前的时段长度，即前间隔（FP）。当在一个测试环节中多个前间隔随机变化时，较长的前间隔会导致更长的感知时长。本研究的目的是确定哪些特征会调节这种效应。在一项要求参与者根据100毫秒的标准对目标间隔的时长进行分类的任务中，前间隔分布在150毫秒、300毫秒或900毫秒的范围内，这些分布的中点（1000毫秒）保持不变。结果表明，在900毫秒范围条件下，可变前间隔长度对感知时长的影响要强得多。更具体地说，这种效应是由于最短前间隔之间的差异。结果还显示，总体而言，300毫秒条件下的短反应比其他范围条件下更多。此外，数据表明分布越窄，辨别能力越好。对主要结果（范围效应）的一种解释是，更宽的分布会导致对前间隔长度的先验不确定性增加。
