CONTRAST, DISPARITY AND STEREOPSIS

描述：(改编自申请人的摘要。)此修订版 提案侧重于对比在立体视觉机制中的作用 深度感知，主要有三个部分：一是局部对比度 将对视差提取机制的模型进行评估并 作为立体视觉处理的模型而开发的。这一模式已经被 从对分频信号的正交滤波器响应的组合导出 对比图像。交叉式和非交叉式过滤器对 差异以相反的方式提供了局部深度输出。模型 是非合作的，最大限度地减少了通信问题，并且易于 计算。第二组实验考察了立体效果。 视网膜成像因素，包括对比度和对比度增益 机制。认为立体视觉完全来自于 巨细胞系统，因此仅从瞬变的、无色差的方面 将对单音输入进行评估。设计了单独的实验 测试小细胞影响的存在形式 立体视觉的持续输入和立体运动的色度输入。 最后，第三组实验将使用环状刺激，其中 单目信息在功能上与视差分离 信息，以允许研究未受污染的视差处理。 单目信息将被限制在高空间频率 而视差分布被限制为低的非重叠范围 空间频率。这些刺激将被用于研究大脑皮层 不受单目线索影响的视差交互作用。

DESCRIPTION: (Adapted from the applicant's abstract.) This revised proposal focuses on the role of contrast in the mechanisms of stereoscopic depth perception, and has three main parts: First, a local contrast energy model for the mechanism of disparity extraction will be evaluated and developed as a model of stereroscopic processing. This model has been derived from a combination of quadrature filter responses to the dichoptic contrast images. Pairs of such filters for crossed and uncrossed disparities provide the local depth output in opponent fashion. The model is non-cooperative, minimizes the correspondence problem, and is easy to compute. The second set of experiments examines the stereoscopic effects of retinal image factors, including contrast and the contrast gain mechanism. The hypothesis that stereopsis is derived solely from the magnocellular system, and hence only from transient, achromatic aspects of the monouclar input, will be evaluated. Separate experiments are designed to test for the presence of a parvicellular influence in the form of sustained input to stereopsis and of chromatic input to stereomotion. Finally, the third set of experiments will use cyclopean stimuli in which the monocular information is functionally segregated from the disparity information, to allow the study of uncontaminated disparity processing. The monocular information will be restricted to high spatial frequencies while the disparity profile is limited to a nonoverlapping range of low spatial frequencies. These stimuli will be used to study cortical disparity interactions without contamination by monocular cues.