LOW-LEVEL VISUAL PROCESSES IN TEXTURE SEGREGATION

毫不费力地立即进行知觉隔离的实验室任务 区域之间的视觉纹理可能是一个很好的模型的重要阶段 在日常视觉感知中--视觉系统崩溃的一种状态 将视觉场景转换为有意义的区域，然后再进行进一步的操作 对每个区域进行计算。对视觉过程的理解 控制地区之间的隔离可以通过以下方式实现 以过去几年积累的大量知识为基础 关于相对较低水平的视觉过程的几十年。结果来自 测量感知纹理分离的心理物理实验(和 几个相关的感知任务)将被收集。这些经验性的 结果将与基于以下因素的定量模型的预测进行比较 关于低级视觉过程的最新知识。这些数量 模型将包含关于模式视觉分析器的知识(多个 对空间有选择性地敏感的并行分析器 频率、方位和空间位置--生理学 其底物可能在视觉皮质的最低区域)，并且还 关于以光适应的名义研究的明显的非线性 (可能起源于视网膜)以及现在的一些非线性行为 已知是皮质细胞的特征。

The laboratory task of effortless and immediate perceptual segregation between regions of visual texture may be a good model f an important stage in everyday visual perception -- a state at which the visual system breaks a visual scene into meaningful regions before going on to do further computations on each region. An understanding of the visual processes controlling the perceived segregation among regions may be gained by building on the vast amount of knowledge that has accrued over the last several decades about relatively low-level visual processes. Results from psychophysical experiments measuring perceived texture segregation (and several related perceptual tasks) will be collected. These empirical results will be compared to predictions from quantitative models based on current knowledge about low-level visual processes. These quantitative models will incorporate knowledge about pattern-vision analyzers (multiple analyzers acting in parallel that are selectively sensitive to spatial frequency, orientation, and spatial position -- the physiological substrate for which may be in the lowest areas of visual cortex) and also about the manifest nonlinearity studied under the name light adaptation (and probably of retinal origin) as well as some nonlinear behavior now known to be characteristic of cortical cells.