Perception of 3D structure and surface properties across the visual field

我的研究计划试图从参与信息从眼睛到大脑的向上流动的低水平机制的角度，尽可能多地解释视觉现象。我研究了编码局部空间结构的机制，如轮廓的方向、纹理边界和对称性以及光流。编码这些特性的机制的特征是通过人体受试者的心理物理实验和构建计算模型来推断的，这些计算模型构成了正在研究的机制的理论。我相信，在下一个资助期，我将继续研究参与对称、定向和光流检测的机制。我特别感兴趣的是，当刺激呈现在视网膜的不同部分时，对对称性和方向的敏感性如何变化。我在光流方面的工作重点是一种被广泛讨论的视觉错觉，称为品娜错觉。它由两个同心的微图案环组成，当它们在视网膜上扩张时，它们似乎朝着相反的方向旋转。理解这种错觉发生的原因将有助于我们理解运动在正常情况下是如何处理的。他说：在我的研究计划中，一个新的方向是关于在外围视觉中感知3D形状的能力。在接下来的五年里，我将进行的研究中有很大一部分将涉及这个问题。这是一个令人兴奋的新方向，因为尽管我们对2D结构的敏感度(如对称性和方向性)如何随视野中的位置变化知道很多，但我们对3D结构的敏感度在周边视觉中如何变化几乎一无所知。因此，扩大我们知识的机会是非常大的。

My research programme seeks to explain as many visual phenomena as possible in terms of low-level mechanisms participating in the upward flow of information from eye to brain. I study mechanisms that encode local spatial structures such as the orientations of contours, texture boundaries and symmetry, and optical flow. The characteristics of mechanisms that encode these properties are inferred through psychophysical experiments with human subjects and the construction of computational models which constitute theories of the mechanisms under study.         In the next funding period I will continue to study mechanisms that participate in the detection of symmetry, orientation and optical flow. I am particularly interested in how sensitivity to symmetry and orientation change when stimuli are presented to different parts of the retina. My work on optical flow focuses on a widely discussed visual illusion known as the Pinna illusion. It consists to two concentric rings of micropatterns that when made to expand on the retina seem to rotate in opposite directions. Understanding why this illusion occurs will help us understand how motion is processed under normal circumstances.         A new direction in my research programme concerns the ability to perceive 3D shape in peripheral vision. A substantial portion of the research I will conduct in the next five years will deal with this issue. This is an exciting new direction because, although we know quite a bit about how sensitivity to 2D structure (e.g., symmetry and orientation) change as a function of position in the visual field, we know almost nothing about how our sensitivity to 3D structures changes in peripheral vision. So the opportunity to expand our knowledge is very great.