Effects of stimulus order on discrimination sensitivity for short and long durations
Effects of stimulus order on discrimination sensitivity for short and long durations
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DOI：
10.3758/s13414-015-0875-8
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发表时间：
2015-05-01
影响因子：
1.7
通讯作者：
Ulrich, Rolf
中科院分区：
文献类型：
--
作者：
Bausenhart, Karin M.;Dyjas, Oliver;Ulrich, Rolf
以往的研究表明，在2AFC任务中，辨别敏感性取决于标准刺激和比较刺激的呈现顺序。本研究探讨了这种所谓的B型效应是否适用于不同的标准幅度。因此，实验1采用了短（100 ms）和长（1,000 ms）的标准持续时间和恒定的刺激间隔（ISI）为1,000 ms的听觉持续时间辨别任务。对于两个标准持续时间，出现了明显的B型效应。在实验2中，对短（300 ms）和长（1，000 ms）ISI和100 ms的恒定标准持续时间进行了辨别灵敏度评估，以检查B型效应是否会减弱甚至逆转，当两种刺激都快速连续出现时，正如先前的研究所建议的那样。在短而非长ISI条件下，B型效应实际上被消除。综上所述，本实验表明，B型效应在标准幅度上是稳健的，但当两种刺激之间的时间间隔减少时，这种效应会减弱。内部参考模型和感觉加权模型的框架内讨论了这一结果模式。它还表明，这两个模型提供了一个定量的帐户目前的结果。
Previous studies have shown that discrimination sensitivity in 2AFC tasks depends on the presentation order of the standard and comparison stimulus. The present study examined whether this so-called Type B effect generalizes across different standard magnitudes. Therefore, Experiment 1 employed an auditory duration discrimination task with short (100 ms) and long (1,000 ms) standard durations and a constant interstimulus interval (ISI) of 1,000 ms. For both standard durations, a clear Type B effect emerged. In Experiment 2, discrimination sensitivity was assessed for short (300 ms) and long (1,000 ms) ISIs and a constant standard duration of 100 ms, in order to examine whether the Type B effect diminishes or even reverses when both stimuli are presented in rapid succession, as was suggested by previous studies. In the short, but not the long ISI condition, the Type B effect was virtually eliminated. Taken together, the present experiments suggest that the Type B effect is robust across standard magnitude, but diminishes when the time interval between both stimuli is reduced. This result pattern is discussed within the framework of the Internal Reference Model and the Sensation Weighting Model. It is also demonstrated that both models provide a quantitative account of the present results.