Klauke Susanne, Wachtler Thomas
J Vis. 2015;15(13):17. doi: 10.1167/15.13.17.
The perceived color of a chromatic stimulus is influenced by the chromaticity of its surround. To investigate these influences along the dimension of hue, we measured hue changes induced in stimuli of different hues by isoluminant chromatic surrounds. Generally, induced hue changes were directed in color space away from the hue of the inducing surround and depended on the magnitude on the hue difference between stimulus and surround. With increasing difference in hue between stimulus and surround, induced hue changes increased up to a maximum and then decreased for larger differences. This qualitative pattern was similar for different inducers, but quantitatively, induction was weaker along some directions in cone-opponent color space than along other directions. The strongest induction effects were found along an oblique, blue-yellow axis that corresponds to the daylight axis. The overall pattern of the induction effect shows similarities to the well-known tilt effect, where shifts in perceived angle of oriented stimuli are induced by oriented surrounds. This suggests analogous neural representations and similar mechanisms of contextual processing for different visual features such as orientation and color.
彩色刺激的感知颜色会受到其周围环境色度的影响。为了沿着色调维度研究这些影响，我们测量了由等亮度彩色背景在不同色调刺激中引起的色调变化。一般来说，诱发的色调变化在颜色空间中朝着远离诱发背景色调的方向，并且取决于刺激与背景之间色调差异的大小。随着刺激与背景之间色调差异的增加，诱发的色调变化先增加到最大值，然后在差异更大时减小。这种定性模式对于不同的诱发物是相似的，但在数量上，在锥体对立颜色空间中，沿着某些方向的诱导比沿着其他方向弱。最强的诱导效应出现在与日光轴相对应的一条倾斜的蓝黄轴上。诱导效应的整体模式与著名的倾斜效应相似，在倾斜效应中，定向背景会诱发定向刺激的感知角度发生偏移。这表明对于不同的视觉特征，如方向和颜色，存在类似的神经表征和类似的上下文处理机制。
