Spatial chromatic contrast sensitivity in natural scenes

有人认为，视觉系统是为处理自然图像而优化的（Barlow, 1961）。在以往的对比敏感度研究中，大多采用光栅等简单刺激。这是基于对更复杂刺激的反应可以从对这些基本刺激的反应中推断出来的想法。最近的研究表明，复杂场景的局部和全局属性决定了检测和识别任务的性能。这对于在视觉系统中处理来自复杂场景的信号的位置具有重要意义。对比灵敏度已经研究了不同类型的消色差调制的灰度图像的自然场景。然而，有研究表明，在自然场景中，颜色在物体的检测、识别和记忆中起着重要作用（Gegenfurtner & Rieger, 2000; Hansen & Gegenfurtner, 2009; Zaidi & Bostic, 2008）。因此，这是一个人为的信息减少，是在这些场景中可用的，如果场景被骗到他们的消色差变化。在这里，我们提出的实验中，我们计划测量在自然场景的图像中彩色和消色差调制的对比灵敏度。

It has been suggested that the visual system is optimized for the processing of natural images (Barlow, 1961). In most previous studies on contrast sensitivity simple stimuli such as gratings have been used. This is based on the idea that responses to more complex stimuli can be inferred from the responses to these basic stimuli. More recent studies have shown that both the local and the global properties of complex scenes determine performance in detection and discrimination tasks. This has important implications for the location where the signals from complex scenes are processed in the visual system. Contrast sensitivity has been investigated for dierent types of achromatic modulations of grayscale images of natural scenes. However, it has been shown that color plays an important role in the detection, identication, and remembrance of objects within naturalistic scenes (Gegenfurtner & Rieger, 2000; Hansen & Gegenfurtner, 2009; Zaidi & Bostic, 2008). Therefore, it is an articial reduction of the information that is available in these scenes if the scenes are conned to their achromatic variations. Here, we propose experiments in which we plan to measure contrast sensitivity for chromatic and achromatic modulations within images of natural scenes.