HIGHER ORDER MECHANISMS IN COLOR VISION

这项建议的主要目标是理解 高阶颜色机制及其在决定分子质量中的可能作用 复杂视觉数组中对象的颜色外观。按更高的顺序 机制是指视觉处理链中超出 大多数传统视觉模型的第二阶段机制。这个 这种机制的存在是通过对 由于观看调制信号而导致的选择性脱敏 字段，以及辨别和检测之间的关系 脉冲的颜色变化。实验计划使用新的程序， 预计会比更强烈地降低高阶机制的敏感性 之前的阶段。此外，更详细地检查了 设计了检测阈值附近脉冲变化的可识别性。 一种精确高效同时测量颜色对比度的新方法 将在参数研究中使用。这些实验的一个目标是 允许预测复杂环境中的颜色外观的通用模型 视觉阵列。另一个目标是阐明 同时对比的过程。 控制和指定色度的新方法的应用 对色觉缺陷的测量提出了刺激措施。这些 这些方法不仅能够有效地诊断先天性颜色 缺陷，但将适用于发现 视网膜后系统。 在单个神经元特性研究中的持续合作 猴子的视觉系统已经计划好了。已被证明是卓有成效的方法 侧膝状核单位的特征将被应用于 V1、V2和V4的皮质系统。

The major goal of this proposal is the understanding of the nature of higher order color mechanisms and their possible role in determining the color appearance of objects in complex visual arrays. By higher order mechanisms are meant elements in the chain of visual processing beyond the second stage mechanisms of most conventional models of vision. The existence of such mechanisms has been suggested by the detailed analysis of the selective desensitization resulting from the viewing of modulated fields, and by the relation between the discrimination and detection of pulse changes in color. Experiments are planned using new procedures which are expected to desensitize the higher order mechanisms more strongly than prior stages. In addition, a more detailed examination of the discriminability of pulse changes near detection threshold are planned. New precise and efficient methods of measuring simultaneous color contrast will be used in parametric studies. One goal of these experiments is a general model which will allow prediction of color appearance in complex visual arrays. Another goal is to shed light on the mechanistic levels of the processes of simultaneous contrast. Applications of the new methods of controlling and specifying chromatic stimuli to the measurement of defective color vision are proposed. These methods will not only be capable of efficiently diagnosing congenital color deficiencies but would be applicable to discovery of defects in post-retinal systems. Continued collaboration in studies of the properties of single neurons in the monkey visual system is planned. Methods which have proved fruitful in the characterization of unis in the lateral geniculate will be applied to cortical systems in V1, V2, and V4.