Polarity selectivity of spatial interactions in perceived contrast
Polarity selectivity of spatial interactions in perceived contrast
复制标题
感知对比度中空间相互作用的极性选择性
作者：
Sato;H.;Motoyoshi I.;& Sato;T
当一个纹理被另一个高对比度的纹理包围时，它的明显对比度会降低。这种对比度-对比度现象被认为是编码对比能量的视觉通道之间的空间相互作用的结果。在本研究中，我们表明，对比度是选择性的亮度极性，通过使用纹理图案组成的稀疏细长斑点。亮（暗）元素纹理的明显对比度只有在被具有相同极性的元素纹理包围时才大幅降低。这种极性特异性是不明显的纹理与高元素密度，这是在以前的研究中使用的那些类似，可能是因为这样的刺激应该不可避免地激活开关型传感器。我们还发现，极性选择性抑制下降的中心和周围的元素之间的取向的差异增加，但仍然为正交取向的元素。这些结果表明，对比度对比错觉在很大程度上取决于空间视觉通道之间的相互作用，是选择性的开-关极性和方向只有微弱的选择性。
The apparent contrast of a texture is reduced when surrounded by another texture with high contrast. This contrast–contrast phenomenon has been thought to be a result of spatial interactions between visual channels that encode contrast energy. In the present study, we show that contrast–contrast is selective to luminance polarity by using texture patterns composed of sparse elongated blobs. The apparent contrast of a texture of bright (dark) elements was substantially reduced only when it was surrounded by a texture of elements with the same polarity. This polarity specificity was not evident for textures with high element densities, which were similar to those used in previous studies, probably because such stimuli should inevitably activate both on-and off-type sensors. We also found that polarity-selective suppression decreased as the difference in orientation between the center and surround elements increased but remained for orthogonally oriented elements. These results suggest that the contrast–contrast illusion largely depends on spatial interactions between visual channels that are selective to on–off polarity and only weakly selective to orientation.