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On the difficulty to think in ratios: a methodological bias in Stevens’ magnitude estimation procedure
Attention, Perception, & Psychophysics ( IF 1.7 ) Pub Date : 2021-03-31 , DOI: 10.3758/s13414-021-02266-5
Alica Mertens , Ulf K. Mertens , Veronika Lerche

In the field of new psychophysics, the magnitude estimation procedure is one of the most frequently used methods. It requires participants to assess the intensity of a stimulus in relation to a reference. In three studies, we examined whether difficulties of thinking in ratios influence participants’ intensity perceptions. In Study 1, a standard magnitude estimation procedure was compared to an adapted procedure in which the numerical response dimension was reversed so that smaller (larger) numbers indicated brighter (darker) stimuli. In Study 2, participants first had to indicate whether a stimulus was brighter or darker compared to the reference, and only afterwards they estimated the magnitude of this difference, always using ratings above the reference to indicate their perception. In Study 3, we applied the same procedure as in Study 2 to a different physical dimension (red saturation). Results from Study 1 (N = 20) showed that participants in the reversal condition used more (less) extreme ratings for brighter (darker) stimuli compared to the standard condition. Data from the unidirectional method applied in Study 2 (N = 34) suggested a linear psychophysical function for brightness perception. Similar results were found for red saturation in Study 3 (N = 36) with a less curved power function describing the association between objective red saturation and perceived redness perception. We conclude that the typical power functions that emerge when using a standard magnitude estimation procedure might be biased due to difficulties experienced by participants to think in ratios.



中文翻译:

关于比率思考的困难:史蒂文斯量值估计程序中的方法论偏差

在新的心理物理学领域,幅度估计程序是最常用的方法之一。它要求参与者评估与参考有关的刺激强度。在三项研究中,我们研究了按比例思考的困难是否会影响参与者的强度感知。在研究1中,将标准幅度估计程序与适应的程序进行了比较,在该程序中,数值响应的维数被反转,因此较小(较大)的数字表示较亮(较暗)的刺激。在研究2中,参与者首先必须指出与参考相比刺激是亮还是暗,然后才估计出这种差异的大小,并始终使用参考之上的等级来表示他们的感知。在研究3中,我们将与研究2中相同的过程应用于不同的物理尺寸(红色饱和度)。研究1(N = 20)表明,与标准条件相比,逆转条件下的参与者对明亮(较暗)刺激使用了更多(更少)极限值。研究2(N = 34)中应用的单向方法得出的数据表明,亮度感知具有线性心理生理功能。在研究3中,红色饱和度的结果相似(N = 36),弯曲功率函数较小,描述了客观红色饱和度和感知的红色度感知之间的关联。我们得出的结论是,由于参与者难以思考比率,使用标准幅度估计程序时出现的典型幂函数可能会产生偏差。

更新日期:2021-04-01
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