NEURAL CORRELATES OF MOVING BOUNDARY PERCEPTION

移动边界感知的神经关联

• 批准号: 6392034
• 负责人: HALUK OGMEN
• 金额: $ 14.75万
• 依托单位: UNIVERSITY OF HOUSTON
• 依托单位国家: 美国
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-09-01 至 2005-05-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6392034
• 关键词: clinical research; computational neuroscience; form /pattern perception; human subject; mathematical model; model design /development; motion perception; perceptual maskings; psychological models; psychophysics; vision

DESCRIPTION: (Adapted from the Investigator's Abstract) The ability to perceive the sharpness of abject boundaries is central to the quality of vision yet very little is know about the underlying neural mechanisms. The broad long-term objective of this research proposal is to reach a more profound understanding of neural mechanisms that determine the perceived form of moving objects in human vision. Under normal viewing conditions, moving objects appear much less blurred than what one would predict from the long duration of visual persistence. This phenomenon is known as motion deblurring. A specific goal of this research is to study the mechanisms underlying motion deblurring and their implications for the perceived form of moving objects. The approach will combine computational and psychophysical methods to test the mechanisms proposed in a neural network model of retino-cortical dynamics. The model leads to the following specific hypotheses: Hypothesis 1 (spatio-temporal profiles): (i) The metacontrast masking function for spatially localized stimuli is oscillatory; (ii) these oscillations are a by-product of the retino-cortical system that occur when it is driven externally by high luminance inputs or internally by focused-arousal/attention; and (iii) the smooth character of the "classical" metacontrast function-extensively reported in the literature-results from spatio-temporal averaging in the post-retinal network. Hypothesis 2 (spatial extent of motion blur): The primary mechanism that determines the length of perceived smear for moving targets is an inhibition from transient cells to sustained cells. Hypothesis 3 (perceived form of motion blur): The brightness profile produced by the retino-cortical dynamics model in response to an isolated moving target will match the psychophysically measured brightness profile of the phenomenon known as "Charpentier's bands."

描述：（改编自研究者的摘要） 感知卑微边界的清晰度的能力对于 视觉质量，但对潜在的神经系统知之甚少 机制。本研究计划的广泛长期目标是实现 对决定感知的神经机制有更深刻的理解 人类视觉中运动物体的形式。在正常观看条件下，移动 物体看起来比人们从长期观察中预测的要模糊得多 视觉暂留的持续时间。这种现象称为运动去模糊。 这项研究的一个具体目标是研究运动背后的机制 去模糊及其对移动物体感知形式的影响。这 方法将结合计算和心理物理学方法来测试 视网膜皮质动力学神经网络模型中提出的机制。这 模型得出以下具体假设： 假设 1（时空剖面）： (i) 元对比掩蔽函数 对于空间局部的刺激是振荡的； (ii) 这些振荡是 视网膜皮质系统被驱动时产生的副产品 外部通过高亮度输入或内部通过集中唤醒/注意力； (iii)“经典”元对比的平滑特征 功能-文献中广泛报道-时空结果 在视网膜后网络中进行平均。 假设 2（运动模糊的空间范围）：主要机制 确定移动目标的感知拖尾长度是一种抑制 从瞬时细胞到持续细胞。 假设 3（运动模糊的感知形式）：产生的亮度分布 通过视网膜皮质动力学模型响应孤立的移动目标 将与心理物理学测量的现象的亮度轮廓相匹配 被称为“夏彭蒂耶乐队”。