NEURAL CORRELATES OF MOVING BOUNDARY PERCEPTIOIN

描述：(改编自《调查者摘要》) 感知卑微边界的锐度的能力是 视觉质量但对潜在的神经知之甚少 机械装置。这项研究提案的广泛长期目标是 对神经机制的更深刻理解，这些神经机制决定了 运动物体在人类视觉中的形式。在正常观看条件下，移动 物体看起来比人们从长远来看的预测要模糊得多 视觉持续性的持续时间。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潜在的运动机制。 去模糊及其对运动物体感知形式的影响。这个 方法将结合计算和心理物理方法来测试 视网膜皮质动力学神经网络模型中提出的机制。这个 该模型得出了以下具体假设： 假设1(时空分布)：(I)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 视网膜皮质系统在驱动时产生的副产品 外部通过高亮度输入或内部通过聚焦唤醒/注意； (3)《古典》元对比的流畅特征 函数--文献中广泛报道--来自时空的结果 视网膜后网络的平均数。 假设2(运动模糊的空间范围)：主要机制是 确定感知到的移动目标的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)：产生的亮度轮廓 视网膜-大脑皮层动力学模型对孤立运动目标的响应 将与心理生理测量的现象的亮度轮廓相匹配 被称为“查彭蒂埃乐队”

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."