NEURAL VISUAL CODING: IMAGE TO OBJECT REPRESENTATION

神经视觉编码：图像到对象的表示

• 批准号: 6829720
• 负责人: JOACHIM RUDIGER VON DER HEYDT
• 金额: $ 40.88万
• 依托单位: JOHNS HOPKINS UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 1979
• 资助国家: 美国
• 起止时间: 1979-06-01 至 2007-11-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6829720
• 关键词: Macaca mulatta; brain electrical activity; form /pattern perception; neural information processing; visual cortex; visual fixation; visual perception

DESCRIPTION (provided by applicant): Funds are requested to continue our studies of image parsing mechanisms in the visual cortex. Contrast border responses in V2 are selective for figure-ground direction (border ownership coding). The aim of the proposed research is to understand the role of this neural border ownership representation in the visual process. Three broad aims are identified for the next five years: The first is to analyze the mechanisms in border ownership assignment. Evidence shows that border ownership signals reflect the image context far beyond the scope of the conventional receptive field, but emerge with short latency and do not require attention. The aim is to study the global form influence (1) by using displays in which some critical features (curvature, corners, X- and T-junctions) are variably occluded, and analyzing the border ownership signal as a function of the exposed features, and (2) by adding visual noise to a low-contrast figure and correlating the noise pattern with the border ownership signal. The second aim is to study the dynamics of the border ownership signal, its rise time and persistence, whether there is memory for border ownership or if the signal decays passively, and whether border ownership assignment is preserved when a figure is moved. The fixation task will be used for aims 1-2. The third aim is to study the role of the image parsing stage as an interface for top-down processes in visual cognition. To study the interaction of border ownership signals with selective attention, monkeys will be trained to perform shape discrimination with partially overlapping figures, so that correct performance of the task requires border ownership assignment. To determine if central processes can influence the figure ground representation in the visual cortex, border ownership signals will be studied while the monkey is performing a visual search task. The studies will focus on area V2, but areas V1 and V4 will also be explored.

描述（由申请人提供）：要求资金继续我们对视觉皮层中图像解析机制的研究。 V2中的对比边界响应对于图形方向（边界所有权编码）是选择性的。拟议研究的目的是了解这种神经边界所有权在视觉过程中的作用。未来五年将确定三个广泛的目标： 首先是分析边境所有权任务中的机制。有证据表明，边界所有权信号反映了图像环境远远超出了传统接收领域的范围，但延迟了，不需要注意。目的是通过使用显示器来研究全球形式的影响（1），其中某些关键特征（曲率，角落，X和T-题材）被多样化，并分析边框所有权信号作为裸露特征的函数，（2）通过将视觉噪声添加到低控制性图形中，并将视觉噪声添加到低控制性图形中，并将噪声模式与边境所有人的所有权相隔离。 第二个目的是研究边界所有权信号的动态，其上升时间和持久性，是否有边界所有权的记忆，还是信号被动地衰落，以及在移动数字时是否保留了边界所有权任务。固定任务将用于目标1-2。 第三个目的是研究图像解析阶段作为视觉认知自上而下过程的界面的作用。为了研究边境所有权信号与选择性关注的相互作用，将对猴子进行培训以用部分重叠的数字进行形状歧视，以便任务的正确执行需要边境所有权分配。为了确定中央流程是否会影响视觉皮层中的图形表示，在猴子执行视觉搜索任务时，将研究边界所有权信号。这些研究将重点放在V2区域，但V1和V4区域也将被探讨。