HIGHER ORDER MECHANISMS IN COLOR VISION

色觉中的高阶机制

• 批准号: 3263117
• 负责人: JOHN KRAUSKOPF
• 金额: $ 16.85万
• 依托单位: NEW YORK UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 1986
• 资助国家: 美国
• 起止时间: 1986-09-01 至 1994-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/3263117
• 关键词: Macaca; color blindness; color visions; cone cell; eye accommodation; human subject; lateral geniculate body; magnetic field; neural information processing; psychometrics; psychophysics; single cell analysis; stimulus /response; vision tests; visual feedback; visual pathways; visual stimulus; visual threshold

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.

该提案的主要目标是理解 高阶颜色机制及其在确定颜色方面的可能作用 复杂视觉阵列中对象的颜色外观。 按更高顺序 机制是指视觉处理链中超越视觉处理的元素 大多数传统视觉模型的第二阶段机制。 这 详细分析表明了这种机制的存在 由于观看调制的图像而产生的选择性脱敏 领域，以及区分和检测之间的关系 脉冲颜色变化。 实验计划使用新程序 预计比高阶机制更强烈地脱敏 之前的阶段。 此外，还进行了更详细的检查 计划区分接近检测阈值的脉冲变化。 同步测量色彩对比度的精确高效的新方法 将用于参数研究。 这些实验的一个目标是 通用模型将允许预测复杂的颜色外观 视觉阵列。 另一个目标是阐明 同时对比的过程。 控制和指定色彩的新方法的应用 提出了测量色觉缺陷的刺激。 这些 方法不仅能够有效地诊断先天性颜色 缺陷，但适用于发现缺陷 视网膜后系统。 继续合作研究单个神经元的特性 猴子视觉系统已规划。 已被证明卓有成效的方法 外侧膝状体中unis的特征将应用于 V1、V2 和 V4 的皮质系统。