Stimulus discriminability is often assessed by comparisons of two successive stimuli: a fixed standard (St) and a varied comparison stimulus (Co). Hellström’s sensation weighting (SW) model describes the subjective difference between St and Co as a difference between two weighted compounds, each comprising a stimulus and its internal reference level (ReL). The presentation order of St and Co has two important effects: Relative overestimation of one stimulus is caused by perceptual time-order errors (TOEs), as well as by judgment biases. Also, sensitivity to changes in Co tends to differ between orders StCo and CoSt: the Type B effect. In three duration discrimination experiments, difference limens (DLs) were estimated by an adaptive staircase method. The SW model was adapted for modeling of DLs generated with this method. In Experiments 1 and 2, St durations were 100, 215, 464, and 1,000 ms in separate blocks. TOEs and Type B effects were assessed with univariate and multivariate analyses, and were well accounted for by the SW model, suggesting that the two effects are closely related, as this model predicts. With short St durations, lower DLs were found with the order CoSt than with StCo, challenging alternative models. In Experiment 3, St durations of 100 and 215 ms, or 464 and 1,000 ms, were intermixed within a block. From the SW model this was predicted to shift the ReL for the first-presented interval, thereby also shifting the TOE. This prediction was confirmed, strengthening the SW model’s account of the comparison of stimulus magnitudes.

中文翻译：

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持续时间辨别中的感觉加权：呈现顺序效应的单变量、多变量和多样化设计研究。


刺激辨别力通常通过比较两个连续刺激来评估：固定标准（St）和变化的比较刺激（Co）。 Hellström 的感觉加权 (SW) 模型将 St 和 Co 之间的主观差异描述为两个加权化合物之间的差异，每个化合物均包含刺激及其内部参考水平 (ReL)。 St 和 Co 的呈现顺序有两个重要影响：对一种刺激的相对高估是由感知时间顺序错误 (TOE) 以及判断偏差引起的。此外，StCo 和 CoSt 阶之间对 Co 变化的敏感性往往不同：B 型效应。在三个持续时间辨别实验中，通过自适应阶梯法估计差异阈值（DL）。 SW 模型适用于用此方法生成的 DL 的建模。在实验 1 和 2 中，不同块中的 St 持续时间分别为 100、215、464 和 1,000 毫秒。 TOE 和 B 型效应通过单变量和多变量分析进行评估，并由 SW 模型很好地解释，这表明这两种效应密切相关，正如该模型预测的那样。由于 St 持续时间较短，CoSt 阶次的 DL 比 StCo 阶次的 DL 更低，这对替代模型提出了挑战。在实验 3 中，100 和 215 毫秒、或 464 和 1,000 毫秒的 St 持续时间在一个块内混合。根据 SW 模型，预计这将改变首次呈现间隔的 ReL，从而也改变 TOE。这一预测得到了证实，加强了 SW 模型对刺激强度比较的解释。