Harvey L O, Gervais M J
J Exp Psychol Hum Percept Perform. 1981 Aug;7(4):741-53. doi: 10.1037//0096-1523.7.4.741.
The relationship between Fourier spectra of visual textures (represented both by the actual frequency components and by the response of four hypothetical channels selectively sensitive to spatial frequency) and the perceptual appearance of the textures was investigated. Thirty textures were synthesized by combining seven spatial frequencies whose amplitudes were randomly chosen and then scaled to give an overall contrast of .9. Similarity judgments were collected using both the method of triadic comparison (two subjects, 4,060 trials each) and the method of paired comparison (six subjects, 435 trials each). The similarity judgments were subjected to MDSCAL and INDSCAL dimensions were found to be optimally oriented in terms of spatial frequency information without rotation. The seven spatial frequency components accounted for 90.6% of the variance in the 3-D INDSCAL space, while the four channels accounted for 91.8% of the variance in the first two dimensions. The data further suggest that the four channels may interact in an opponent process manner. The results support the idea that the visual internal representation of stimuli is based on spatial frequency analysis rather than feature extraction.
研究了视觉纹理的傅里叶光谱（由实际频率成分以及对空间频率有选择性敏感的四个假设通道的响应来表示）与纹理的感知外观之间的关系。通过组合七个空间频率合成了30种纹理，这些频率的幅度是随机选择的，然后进行缩放以给出0.9的整体对比度。使用三联比较法（两名受试者，每人4060次试验）和配对比较法（六名受试者，每人435次试验）收集相似性判断。对相似性判断进行多维尺度分析（MDSCAL），发现独立成分分析（INDSCAL）维度在不旋转的情况下根据空间频率信息最佳定向。七个空间频率成分占三维INDSCAL空间中方差的90.6%，而四个通道占前两个维度中方差的91.8%。数据进一步表明，这四个通道可能以对立过程的方式相互作用。结果支持了这样一种观点，即刺激的视觉内部表征是基于空间频率分析而不是特征提取。
