Moulden B, Kingdom F
Department of Psychology, University of Reading, Whiteknights, UK.
Spat Vis. 1990;5(2):101-28. doi: 10.1163/156856890x00020.
With the aid of a matching technique, the magnitude of induced brightness in bars bordered with Craik-Cornsweet-O'Brien (CCOB) edges was investigated as a function of the width and amplitude of those edges. Data were collected for stimuli with the sloping part of the edge on both the inside and outside of the bar, and also for stimuli with both positive-going and negative-going edges. The results confirmed previous reports that induced brightness was greater for CCOB stimuli with negative-going, as opposed to positive-going, edges and greater for CCOB stimuli whose edges contained outer, as opposed to inner gradients. A model of brightness coding is offered to provide an explanation for the specific anisotropies observed, as well as the general effects of stimulus amplitude and width on induced brightness. The model assumes that a symbolic description of brightness is generated separately from each of a number of different-sized 2DG (second difference of a Gaussian) filters, and the resulting brightness profile obtained by averaging across the separate descriptions. The ability of other brightness models to account for the data is also discussed.
借助匹配技术，研究了与克莱克 - 科恩斯威特 - 奥布赖恩（CCOB）边缘相邻的条形区域中诱导亮度的大小与这些边缘的宽度和幅度之间的函数关系。收集了边缘倾斜部分在条形区域内部和外部的刺激数据，以及具有正向和负向边缘的刺激数据。结果证实了先前的报告，即对于具有负向边缘而非正向边缘的CCOB刺激，诱导亮度更大；对于边缘包含外部梯度而非内部梯度的CCOB刺激，诱导亮度更大。提供了一个亮度编码模型，以解释观察到的特定各向异性以及刺激幅度和宽度对诱导亮度的一般影响。该模型假设亮度的符号描述是由多个不同大小的2DG（高斯二阶差分）滤波器分别生成的，然后通过对这些单独描述进行平均得到最终的亮度分布。还讨论了其他亮度模型解释这些数据的能力。
