Gaze scanning by walking people with visual field loss

项目摘要 在移动任务中，我们通常通过移动眼睛和头部来环视周围的环境。因为眼球运动 幅度通常很小(&lt；15？)，头部移动对凝视扫描的贡献可能更大，并且 更重要的是。对于行走中有视野丧失的患者，我们之前的研究没有发现他们的眼睛 活动的分散范围比通常看到的要大。剩下的问题是，患者是否主要是扫描 通过移动它们的头。然而，由于头部跟踪的技术挑战，对头部的研究 户外行走场景中的运动行为比眼动场景中的运动行为相对稀疏。再过几天 包括头部跟踪的研究，调查要么在虚拟环境中进行，要么 仅对头部运动进行了定性评估。 在这个项目中，我们建议对以前联邦资助的数据进行二次分析 研究项目，在这些项目中，我们用头戴式摄像机记录了头部和场景视频 在波士顿繁忙的街道上行走时，视野丧失的患者和正常视力的对照组 闹市区。为了从现场视频中提取头部运动，我们将使用最新的3D视觉映射 近年来，随着技术被应用于自动驾驶研究，这项技术有了很大的进步 如今。这将是第一次完整的凝视扫描模式，包括头部的运动 对室外开放环境中的视障人群进行了定量评价。 之前收集的视频还包括一种干预条件，在这种情况下，患者的半视野丧失 戴着棱镜场扩张器走路。通过比较有无注视扫描行为 视野扩张器，我们将能够理解凝视扫描行为是如何被干预的。这个 从这项研究中获得的知识可能会为低视力康复社区提供潜在的信息。

Project Summary In mobility tasks, we look around the environment usually by moving both eye and head. Since eye movement amplitude is usually small (<15º), the contribution of head movement to the gaze scanning may be larger and more important. For patients with visual field loss in walking, our previous studies did not find their eye movements dispersed wider than normally sighted. A remaining question is whether the patients primarily scan by moving their heads. However, due to the technically challenges in head tracking, research on head movement behaviors in outdoor walking scenarios is relatively sparse than that for eye movement. In a few studies that do include head tracking, the investigation was either conducted in virtual environment, or the head movements were only qualitatively assessed. In this project, we propose to conduct secondary analysis of data collected in previous federally funded research projects, in which we recorded the eye-in-head and scene videos with a head mounted camera in patients with visual field loss as well as normally sighted controls, as they walked on busy streets in Boston downtown area. To extract head movements from the scene videos, we will use the latest 3D visual mapping technology, which has substantially advanced in recent years as it is been applied to self-driving research nowadays. This would be the first time the complete gaze scanning patterns including the head movements of the visually impaired people in an open outdoor environment are quantitatively evaluated. The previously collected videos also include an intervention condition, where the patients with hemi-field loss walking while wearing a prism field expander. By comparing the gaze scanning behavior with and without the field expander, we would be able to understand how gaze scanning behaviors can be intervened. The knowledge gained from this research can potentially inform the low vision rehabilitation community.