Inter-Areal Cooperativity & Visual Contours Perception

区域间合作

• 批准号: 6736254
• 负责人: ANNA W. ROE
• 金额: $ 40.23万
• 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 2007-04-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6736254
• 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）：本研究计划的目标是 了解初级视觉皮层 (V1) 和第二视觉皮层的作用 真实和虚幻亮度感知中的区域（V2）。在之前的支持中 循环，我们研究了真实和虚幻轮廓处理的组织 猕猴视觉皮层的 V1 和 V2 域。我们发现信号 V1和V2在处理真实轮廓时是相似的，但是 与虚幻轮廓的互补（Ramsden et al., 2001）。这些 研究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 建议考察真实和虚幻亮度的处理是否具有可行性 与真实和虚幻轮廓处理的任何相似之处。 我们对表面亮度的感知是由绝对亮度决定的 以及亮度对比度。最近，研究使用同步对比 刺激建立了对亮度调制的亮度响应 在猫的第 17 区可以观察到侧翼区域（Rossi et. al., 1996； 罗西和帕拉迪索，1999）。虽然这表明亮度感知 由于表面亮度对比度可以早在初级视觉中就可以实现 皮层，目前尚不清楚对比边界是否也会导致这种情况 亮度响应。在这里，我们建议检查一个神经处理 边界引起的亮度感知，Craik-O'Brien-Cornsweet 错觉。使用 电生理学和光学成像方法，我们的目的是检查 猫和猴子的 V1 和 V2 对真实和边界诱导的反应 亮度刺激。我们的目标是定位 V1 和 V2 中的皮质室 涉及真实和虚幻的亮度处理。此外，我们将 通过研究单个单元响应，确定实际的相位关系 和错觉反应，以及错觉反应的空间范围 皮质。通过使用不同的虚幻亮度条件，我们的目的是识别 表面和边界对亮度神经编码的贡献 洞察力。