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Fechner's Elusive Parallel Law

机译：费希纳的难以捉摸的平行定律

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摘要

Weber's Law states that the differential threshold or just-noticeable-difference (jnd) is proportional to the physical intensity of the stimulus. Fechner built up his logarithmic law of sensation intensity from Weber's Law and the assumption that all jnds are subjectively equal. He thought it important that the Parallel Law should also hold. The Parallel Law states that, when perceived stimulus intensity is changed by something other than physical intensity (such as adaptation), Weber's Law continues to hold: discrimination should be unchanged provided the perceived values of the two stimuli change in the same ratio. Fechner claimed that weight discrimination was unaffected by weight adaptation; he was unsure about light adaptation; and he claimed that tactile length discrimination was unaffected by perceived changes caused by the bodily location of the stimulus. Modem research on adaptation for weights and other sensory stimuli shows that changes occur both in perceived intensity and in discrimination. Discrimination between stimuli is usually finest when the adaptation level is appropriate to the test level. There is insufficient evidence concerning the discrimination of tactile length and visual length when perceived length is changed. However, the Parallel Law may be untestable because of the difficulty of obtaining measures in the same experiment both for changes in discrimination and for the ratios of the perceived changes of the stimuli.
机译：韦伯定律指出，微分阈值或正好可察觉的差异（jnd）与刺激的物理强度成正比。费希纳根据韦伯定律和所有主观都是主观相等的假设建立了他的感觉强度对数定律。他认为平行法也应保持重要。平行定律指出，当感知刺激强度除物理强度（如适应性）以外的其他变化时，韦伯定律继续成立：只要两个刺激的感知值以相同的比率变化，歧视就应该保持不变。费希纳（Fechner）声称体重歧视不受体重适应的影响;他不确定光线适应能力;他声称，触觉长度的辨别不受刺激的身体位置引起的感知变化的影响。关于重量和其他感觉刺激适应的现代研究表明，感知强度和辨别力都发生变化。当适应水平适合于测试水平时，通常最好区分刺激。没有足够的证据表明当感知长度改变时，对触觉长度和视觉长度的区分。但是，平行法可能是无法测试的，因为难以在同一实验中获得分辨力的变化和感知到的刺激变化的比率的度量。

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