Contrast conservation in human vision
Contrast conservation in human vision
复制标题
DOI：
10.1016/s0042-6989(03)00441-3
复制
发表时间：
2003-11-01
期刊：
影响因子：
1.8
通讯作者：
Makous, W
中科院分区：
文献类型：
--
作者：
Fiser, J;Bex, PJ;Makous, W
视觉体验。它由高对比度复杂场景的短暂扫视采样定义，通常使用阈值对比度的静态光栅进行研究。为了研究阈上视觉处理与阈值视觉的关系，我们在自然条件下的扫视过程中，在刺激发生大的突然变化的情况下，测试了对比度的时间整合。我们观察到完全不同的影响下的阈值和阈上观看条件。阈值对比度的连续呈现的光栅，无论是垂直取向或倒置的相位显示概率求和，这意味着独立的视觉检测器之间没有可检测的相互作用。然而，在阈上水平，我们发现完整的代数总和的刺激时间超过53毫秒的对比度。在随机噪声模式之间的突然变化和自然场景之间的相同结果。这些结果不能用传统的对比度增益控制机制或对比度恒定性的影响来解释。相反，在阈上水平下，视觉系统似乎保存了来自最近观看的图像的对比度信息，也许是为了在眼睛从一个地方扫视到另一个地方时有效地评估视觉场景的对比度。(C)2003 Elsevier Ltd.保留所有权利。
Visual experience. which is defined by brief saccadic sampling of complex scenes at high contrast, has typically been studied with static gratings at threshold contrast. To investigate how suprathreshold visual processing is related to threshold vision, we tested the temporal integration of contrast in the presence of large, sudden changes in the stimuli such occur during saccades under natural conditions. We observed completely different effects under threshold and suprathreshold viewing conditions. The threshold contrast of successively presented gratings that were either perpendicularly oriented or of inverted phase showed probability summation, implying no detectable interaction between independent visual detectors. However, at suprathreshold levels we found complete algebraic summation of contrast for stimuli longer than 53 ms. The same results were obtained during sudden changes between random noise patterns and between natural scenes. These results cannot be explained by traditional contrast gain-control mechanisms or the effect of contrast constancy. Rather, at suprathreshold levels, the visual system seems to conserve the contrast information from recently viewed images, perhaps for the efficient assessment of the contrast of the visual scene while the eye saccades from place to place. (C) 2003 Elsevier Ltd. All rights reserved.