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Investigations of low level visual representations.

机译：低级视觉表示的调查。

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摘要

Part 1. Two briefly flashed 6-by-6 random block patterns separated by a 1 sec. ISI are judged (with feedback) on whether they were different in the contrast polarity of a single square. The quadrants were tinted gray, green, red, and blue, greatly impairing performance in comparison to monochromatic block patterns, suggesting that the visual code for random block patterns does not allow separation of contrast from color information. Squares abutting the target were equal in contrast strongly increased the probability of detection. Squares diagonally adjacent to the target moderately facilitated detection. These results show that detection of a change in a random block pattern is strongly influenced by the local context in which the change occurs. In particular, changes that alter the topology of the local pattern are better detected than those that do not. Part 2. Classification images enable estimation of the linear component of the decision statistic used by observers in making a given type of judgment. We introduce a more powerful method called projective perceptual template analysis and apply it to analyzing brightness judgments. We use the method to measure the Perceptual Template (PT) used in judging the whether the mean luminance of a textured target disk is higher or lower than the luminance of a homogeneous background. We test the prediction that only those parts of the disk near the boundary will (positively) influence judgments. Our findings imply that luminance information from the center of the region, in addition to parts of the disk near the boundary, influence judgments. Part 3. Projective perceptual template analysis was applied to a test disk embedded in a noisy annulus. The task was to judge whether the test disk was lighter or darker than the neutral grey background. The annulus was composed of rings embedded in noise, similar in construction to the disk in Part 2. The PT showed that the disk/annulus border was negatively correlated with the test disk, suggesting contrast repulsion. The annulus/background border was positively correlated with the test disk, suggesting contrast assimilation.
机译：第1部分。两个短暂闪烁的6 x 6随机块模式，相隔1秒。判断ISI（有反馈）它们在单个正方形的对比度极性上是否不同。象限为灰色，绿色，红色和蓝色，与单色块图案相比，极大地降低了性能，这表明用于随机块图案的可视代码不允许将对比度与颜色信息分开。相反，与目标相邻的正方形相等，大大增加了检测的可能性。对角线邻近目标的正方形适度地促进了检测。这些结果表明，随机块模式变化的检测受到变化发生的局部上下文的强烈影响。尤其是，与未更改相比，可以更好地检测到更改本地模式的拓扑的更改。第2部分。分类图像使得能够估计观察者在做出给定类型的判断时所使用的决策统计量的线性分量。我们介绍了一种更强大的方法，称为投影感知模板分析，并将其应用于分析亮度判断。我们使用该方法来测量用于判断纹理目标盘的平均亮度是高于还是低于同质背景的亮度的感知模板（PT）。我们测试了这样的预测：只有磁盘靠近边界的那些部分（肯定）会影响判断。我们的发现暗示，除了靠近边界的磁盘部分之外，来自区域中心的亮度信息也会影响判断。第3部分。投影感知模板分析应用于嵌入有噪声环带中的测试盘。任务是判断测试盘是否比中性灰色背景更亮或更暗。环由嵌入噪声中的环组成，其结构与第2部分中的磁盘相似。PT显示，磁盘/环边界与测试磁盘呈负相关，表明存在排斥作用。环面/背景边界与测试盘呈正相关，表明对比吸收。

著录项

  • 作者

    Kies, Steven.;

  • 作者单位

    University of California, Irvine.;

  • 授予单位 University of California, Irvine.;
  • 学科 Psychology Cognitive.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 82 p.
  • 总页数 82
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 心理学;
  • 关键词

  • 入库时间 2022-08-17 11:38:24

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