Li Kashi, Nagai Takehiro
Department of Information and Communications Engineering, Tokyo Institute of Technology, 4259-G2-1 Nagatsuta-cho, Midori-ku, Yokohama, 226-8502, Japan.
Sci Rep. 2024 Jun 13;14(1):13665. doi: 10.1038/s41598-024-64215-0.
Previous studies have identified differences in sensitivity characteristics between color discrimination and perception of suprathreshold color differences. However, it remains highly unclear how color difference sensitivity changes with increasing magnitudes of color difference along various color hues. This study aimed to quantify the sensitivity transition across various magnitudes of color differences and uncover the underlying mechanisms. Color discrimination sensitivities were measured using an adaptive staircase method for 32 isoluminant pedestal colors in the u'v' chromaticity diagram. For suprathreshold color differences, we employed the Maximum Likelihood Difference Scaling (MLDS) method to measure sensitivity to various color difference levels for the same 32 colors. Our findings confirmed the differences in sensitivity characteristics between discrimination and suprathreshold color difference perception. Furthermore, we observed increased sensitivities at many color category boundaries in suprathreshold color difference perception. By investigating the relation between the category effects and the color difference size levels through a model simulation, our findings suggest that the influence of color categories on the perception of color differences may become more pronounced as the magnitude of color differences increases.
以往的研究已经确定了颜色辨别与超阈值颜色差异感知之间的敏感度特征差异。然而，目前仍不清楚沿各种颜色色调，色差敏感度如何随着色差幅度的增加而变化。本研究旨在量化不同幅度色差的敏感度转变，并揭示其潜在机制。在u'v'色度图中，使用自适应阶梯法测量了32种等亮度背景颜色的颜色辨别敏感度。对于超阈值颜色差异，我们采用最大似然差异标度法（MLDS）来测量对相同32种颜色的不同色差水平的敏感度。我们的研究结果证实了辨别与超阈值颜色差异感知之间的敏感度特征差异。此外，我们观察到在超阈值颜色差异感知中，许多颜色类别边界处的敏感度有所增加。通过模型模拟研究类别效应与色差大小水平之间的关系，我们的研究结果表明，随着色差幅度的增加，颜色类别对颜色差异感知的影响可能会更加显著。
