Inter-Areal Cooperativity & Visual Contours Perception

区域间合作

• 批准号: 6858113
• 负责人: ANNA W. ROE
• 金额: $ 18万
• 依托单位: VANDERBILT UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-03-01 至 2005-04-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6858113
• 关键词: Aotus; Macaca; behavioral /social science research tag; brightness discrimination; cats; cell cell interaction; electrophysiology; form /pattern perception; histology; illusions; image processing; microelectrodes; neural information processing; optics; single cell analysis; visual cortex; visual perception; visual stimulus

DESCRIPTION (Provided by applicant): The goal of this research proposal is to understand the role of primary visual cortex (V1) and second visual cortical area (V2) in real and illusory brightness perception. In the previous support cycle, we investigated the organization of real and illusory contour processing domains in V1 and V2 of the macaque monkey visual cortex. We found that signals from V1 and V2 are similar during the processing of real contours, but complementary during that of illusory contours (Ramsden et al., 2001). These findings may suggest that the encoding of contour identity is dependent on the coordinated activation of multiple cortical areas. In this support cycle, we propose to examine whether the processing of real and illusory brightness bears any parallels with that of real and illusory contour processing. Our perception of surface brightness is determined both by absolute luminance as well as by luminance contrast. Recently, studies using simultaneous contrast stimuli established that a brightness response to luminance modulation of flanking regions can be observed in Area 17 of the cat (Rossi et. al., 1996; Rossi & Paradiso, 1999). Although this demonstrated that brightness percepts due to surface luminance contrast can be implemented as early as primary visual cortex, it remained unclear whether contrast borders also contribute to this brightness response. Here, we propose to examine the neural processing of a border-induced brightness percept, the Craik-O'Brien-Cornsweet illusion. Using electrophysiological and optical imaging methods, we aim to examine the responses of V1 and V2 in both the cat and monkey to real and border-induced brightness stimuli. We aim to localize cortical compartments in V1 and V2 involved in real and illusory brightness processing. In addition, we will determine, by studying single-unit responses, the phase relationships of real and illusory responses, and the spatial extent of illusory response in the cortex. By using different illusory brightness conditions, we aim to identify surface and border contributions to the neural encoding of brightness perception.

描述（由申请人提供）：该研究建议的目的是 了解主要视觉皮层（V1）和第二视觉皮质的作用 面积（v2）在真实和虚幻的亮度感知中。在先前的支持中 循环，我们研究了真实和虚幻的轮廓处理的组织 猕猴视觉皮层的V1和V2中的域。我们发现信号 从V1和V2处理实际轮廓期间相似，但是 在虚幻的轮廓期间的补充（Ramsden等，2001）。这些 调查结果可能表明，轮廓身份的编码取决于 多个皮质区域的协调激活。在这个支持周期中，我们 建议检查真实和虚幻的亮度的处理是否熊 与真实和虚幻的轮廓处理的任何相似之处。 我们对表面亮度的看法是通过绝对亮度确定的 以及亮度对比。最近，使用同时对比的研究 刺激确定了对亮度对亮度调制的亮度响应 可以在猫的17区观察到侧翼区域（Rossi et al。，1996; Rossi＆Paradiso，1999）。尽管这表明亮度感知 由于表面亮度对比度，可以最早在主要视觉上实施 皮层，尚不清楚对比边界是否也有助于这 亮度响应。在这里，我们建议检查 边界引起的亮度感知，craik-o'brien-cornsweet幻觉。使用 电生理和光学成像方法，我们旨在检查 猫和猴子对真实和边界引起的v1和v2的响应 亮度刺激。我们旨在将皮质隔室定位在V1和V2中 参与真实和虚幻的亮度处理。此外，我们将 通过研究单单元响应，确定真实的相位关系 和虚幻的反应以及虚幻响应的空间范围 皮质。通过使用不同的虚幻亮度条件，我们旨在确定 表面和边界对亮度神经编码的贡献 洞察力。