Spatial chromatic contrast sensitivity in natural scenes

有人提出，视觉系统是为处理自然图像而优化的(Barlow，1961)。在以前大多数关于对比敏感度的研究中，都使用了简单的刺激，如光栅。这是基于这样一种想法，即对更复杂的刺激的反应可以从对这些基本刺激的反应中推断出来。最近的研究表明，复杂场景的局部和全局属性都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。研究了不同类型的自然景物灰度图像的消色差调制的对比度敏感性。然而，已有研究表明，颜色在自然主义场景中对物体的识别、识别和记忆中起着重要作用(Gegenfutner&Rieger，2000；Hansen&Gegenfutner，2009；Zaidi&Bostic，2008)。因此，如果场景被欺骗到它们的非彩色变化，这是对这些场景中可用信息的人为减少。在这里，我们提出了一些实验，在这些实验中，我们计划测量自然场景图像中彩色和非彩色调制的对比度敏感性。

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.