Threshold variability in subliminal perception experiments: fixed threshold estimates reduce power to detect subliminal effects.
Threshold variability in subliminal perception experiments: fixed threshold estimates reduce power to detect subliminal effects.
复制标题
阈下感知实验中的阈值可变性：固定阈值估计会降低检测阈下效应的能力。
DOI：
10.1037//0096-1523.17.3.841
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
Miller,J
中科院分区：
文献类型：
--
作者：
Miller,J
在阈下知觉的研究中，通常会为每个S（例如，产生机会辨别性能的刺激持续时间）估计一个意识阈值。这篇文章表明，如果S的真实阈值随机变化，从审判到审判，估计一个固定的阈值有重要的后果。具体而言，估计阈值接近真实阈值分布的最小值，并且检测阈下感知的实验的功率降低。因为有很多证据表明，真实的阈值在不同的试验中是不同的，阈值的变化可能严重削弱了以前测试潜意识感知的实验。幸运的是，它是可能的，以估计最大的功率损失造成的阈值的变化，因此，设计一个实验与可接受的功率，即使在存在的变化。（PsycINFO数据库记录（c）2016阿帕，保留所有权利）
In studies of subliminal perception, a threshold for awareness is usually estimated for each S (eg, the stimulus duration that yields chance discrimination performance). This article shows that if the S's true threshold varies randomly from trial to trial, estimation of a fixed threshold has important consequences. Specifically, the estimated threshold approaches the minimum of the distribution of true thresholds, and the power of an experiment to detect subliminal perception is reduced. Because there is much evidence that true thresholds vary across trials, threshold variability may have seriously weakened previous experiments that tested for subliminal perception. Fortunately, it is possible to estimate the maximum power loss resulting from threshold variability and therefore to design an experiment with acceptable power even in the presence of variability.(PsycINFO Database Record (c) 2016 APA, all rights reserved)