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NEURAL CORRELATES OF MOVING BOUNDARY PERCEPTION

移动边界感知的神经关联

基本信息

批准号：
6752106
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
项目类别：
财政年份：
1992
资助国家：
美国
起止时间：
1992-09-01 至 2006-05-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/6752106
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

项目摘要

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：（改编自研究者摘要）感知卑鄙边界的清晰度的能力是视觉质量，但很少有人知道潜在的神经机制等这项研究计划的长远目标是达到更深刻地理解决定感知的神经机制人类视觉中移动物体的形式。在正常观看条件下，物体看起来比人们从长时间观测中预测的要模糊得多。视觉持续时间。这种现象被称为运动去模糊。这项研究的一个具体目标是研究运动的机制去模糊及其对移动物体感知形式的影响。的方法将结合联合收割机计算和心理物理学的方法来测试视网膜-皮质动力学的神经网络模型中提出的机制。的模型得出以下具体假设：假设1（时空分布）：（一）元对比掩蔽函数对于空间局部化的刺激是振荡的;（ii）这些振荡是一个副产品的视网膜皮质系统时，发生的驱动外部通过高亮度输入或内部通过聚焦唤醒/注意; 以及（iii）“经典”元对比的平滑特征功能-在文献中广泛报道-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）：确定移动目标的感知拖影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）：视网膜-皮层动力学模型对孤立运动目标的响应将匹配心理测量的亮度轮廓的现象被称为“夏彭蒂埃带”"