Mechanisms of Intermediate Distance Space Perception

中距离范围（2-25米）的视觉空间感知具有多方面的功能。它 允许观察者感知物体的3D形状，大小和位置，在空间中定向并引导我们的 行动然而，尽管它在使观察者能够在自然环境中互动方面很重要， 对中距离空间感知的基本机制的知识是不完整的。 关于在地面上定位物体的能力，以前的研究发现， 通过构建地面的表示来实现这一点，然后将其用作参考帧， 定位对象。为了定位悬挂的物体，需要确定物体与物体之间的相对位置。 悬挂物体和地面参考框架。最近的实证研究提供了关键证据， 为地基空间感知的概念，并导致了几个基本的发现 用于表示地面的机制。这一进展促使制定了一项更加 理解视觉系统如何形成基于地面的 知觉空间目前建议的目标是寻求可量化的经验证据， 推进框架。将调查以下三个定义广泛的问题： A.地面和天花板表面表征的感知机制 B。空间知觉中的选择假设与注意操作 C.定位不与地面直接接触的物体 从拟议的项目中获得的知识将推动人类空间感知科学的发展。 中距离范围。它还将提高对空间感知和行动问题的理解 具有视觉缺陷的患者遇到的问题（例如，斜视和弱视患者），以及 普通人在非最佳视觉环境中遇到的问题。此外，为了补充 研究在真实的环境中，拟议的项目将调查空间感知在虚拟 通过利用虚拟现实技术，这种方法不仅适用于控制 实验刺激，但也将产生洞察如何才能提高沉浸式质量的 虚拟场景

Visual space perception in the intermediate distance range (2-25 meters) serves a multi-faceted function. It allows the observer to perceive the 3D shapes, sizes and locations of objects, orient in space and guide our actions. Yet, despite its importance in enabling the observer to interact in the natural environment, knowledge of the mechanisms underlying space perception in the intermediate distance is incomplete. Pertaining to the ability to locate an object on the ground, previous work found that the visual system achieves this by constructing a representation of the ground surface and then uses it as a reference frame to localize the object. To localize a suspended object requires determining the relative position between the suspended object and the ground reference frame. Recent empirical studies have provided critical evidence for the notion of a ground-based space perception, and led to the discovery of several fundamental mechanisms for representing the ground surface. This progress has motivated the formulation of a more comprehensive theoretical framework for understanding how the visual system forms the ground-based perceptual space. The goal of the current proposal is to seek quantifiable empirical proofs to substantiate and advance the framework. The following three broadly defined issues will be investigated: A. The Perceptual Mechanisms for Representing the Ground Surface and Ceiling Surface B. The Selection Hypothesis and Attention Operation in Space Perception C. Locating an Object that Does Not Have a Direct Surface Contact with the Ground The knowledge gained from the proposed project will advance the science of human space perception in the intermediate distance range. It will also improve understanding of the space perception and action problems encountered by patients with visual deficits (e.g., those with strabismus and amblyopia), as well as problems encountered by ordinary people in non-optimal visual environments. Furthermore, to complement the research in the real environment, the proposed project will investigate space perception in the virtual environment by capitalizing on the virtual reality technology. This approach is not only useful for controlling the experimental stimulation, but will also yield insights into how one can improve the immersive quality of virtual scenes.