Maertens Marianne, Wichmann Felix A
Modelling of Cognitive Processes Group, Department of Software Engineering and Theoretical Computer Science, Technische Universität Berlin, Berlin, Germany.
J Vis. 2013 May 31;13(6):21. doi: 10.1167/13.6.21.
A fundamental question in visual perception research is whether the sensitivity to stimulus differences is limited by the sensory representation of the external stimulus, that is, the proximal stimulus, or by its perceptual representation, i.e., stimulus appearance. In the domain of lightness perception, the question translates into whether discrimination thresholds depend on the local luminance in the retinal image or on the apparent lightness of the corresponding image region. The majority of findings seem to indicate that sensitivity is limited by the sensory stimulus representation, which would imply different mechanisms for stimulus discrimination and appearance. We think this conclusion needs to be qualified. We report data suggesting that the relationship between discrimination and appearance judgments depends on how exactly they are being measured. We propose a theoretical account that provides a common mechanism for appearance and sensitivity. An interesting corollary of this model is that it also accounts for the perceptual phenomenon of assimilation.
视觉感知研究中的一个基本问题是，对刺激差异的敏感度是受外部刺激的感官表征（即近端刺激）限制，还是受其感知表征（即刺激外观）限制。在明度感知领域，这个问题转化为辨别阈值是取决于视网膜图像中的局部亮度，还是取决于相应图像区域的表观明度。大多数研究结果似乎表明，敏感度受感官刺激表征的限制，这意味着刺激辨别和外观有不同的机制。我们认为这一结论需要修正。我们报告的数据表明，辨别判断和外观判断之间的关系取决于它们的具体测量方式。我们提出了一种理论解释，为外观和敏感度提供了一种共同机制。该模型一个有趣的推论是，它也解释了同化的感知现象。
