NEURAL CORRELATES OF MOVING BOUNDARY PERCEPTIOIN

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的感知形式的影响。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”"

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."