MULTISENSORY INTEGRATION AND HUMAN POSTURAL CONTROL

这项研究的长期目标是了解多感官 输入在控制人的直立姿势时相互作用，以提供 中心或中心位置后果的经验-理论基础 外周感觉缺陷。为了保持直立，至关重要的是 了解不同身体部位的相对位置，包括 质心，相对于周围环境。我们是如何 构建这样一个内部模型是未知的，但被认为是 严重依赖于关于我们身体的多感官信息 线段和周围环境。重要的问题是 不同的感觉输入如何相互作用于姿势控制在很大程度上 悬而未决。我们建议同时操控视觉和 体感刺激，并分析多感官之间的耦合 信息和姿态的摇摆。具体目标是：1.建立 多感官整合的基础是形成稳定的空间- 姿势摆动与多感觉的时间关系 信息..我们将操纵时间和空间结构 同时提供视觉和体感信息，并研究 多感官刺激和姿势摆动之间的耦合。是 耦合依赖于模式(视觉与躯体感觉)或 感觉输入的特性(空间、时间)？2.研究 多感觉信息的感觉融合是在姿势中实现的 控制力。我们将通过实验“分离”两个感官输入 为每个人呈现不同的时间结构。到时候我们会的 分析姿势摆动与多感官的耦合 观察多感官信息如何融合或如何融合的信息 可以选择单个感觉源。3.研究……过程 对多感官信息的姿势适应。姿势反应 单独的视觉或躯体感觉输入频率的突然变化 会被比作这两种刺激的共同变化。这是怎么回事 姿势控制系统适应多感觉信息，而不是 对单一刺激的反应？改编的时间进程是什么？4.到 研究任务依赖对多感觉整合的影响。 我们将研究姿势的耦合如何影响多感官 信息受检测任一移动的指令的影响 视觉或体感线索。问题是，这种关注是如何 改变刺激的感知质量，从而改变 对这种刺激的姿势反应。

The long-term goal of this research is to understand how multisensory inputs interact in the control of human upright stance to provide an empirical-theoretical basis of the postural consequences of central or peripheral sensory deficits. In order to remain upright, it is crucial to know the relative position of different body segments, including the center of mass, relative to the surrounding environment. How we construct such an internal model is unknown, but is thought to be heavily dependent upon multisensory information about our own body segments and the surrounding environment. The important question of how the various sensory inputs interact for postural control is largely unresolved. We propose to simultaneously manipulate visual and somatosensory stimuli, and analyze the coupling between multisensory information and postural sway. The specific aims are: 1. To establish that multisensory integration is based on forming stable spatio- temporal relationships between postural sway and multisensory information.. We will manipulate the temporal and spatial structure of visual and somatosensory information simultaneously and study the coupling between multisensory stimuli and postural sway. Is the coupling dependent on mode (vision vs. somatosensation) or on properties of the sensory input (spatial, temporal)? 2. To study how sensory fusion of multisensory information is achieved in postural control. We will experimentally "pull apart" two sensory inputs by presenting each with a different temporal structure. We will then analyze the coupling between postural sway and multisensory information to observe how multisensory information is fused or how a single sensory source may be selected. 3. To study the process of postural adaptation to multisensory information. Postural responses to an abrupt change in frequency of visual or somatosensory inputs alone will be compared to a change in both stimuli together. How does the postural control system adapt to multisensory information as opposed to single stimuli? What is the time course of that adaptation? 4. To study the influence of task dependence on multisensory integration. We will study how the coupling of postural sway to multisensory information is influenced by instructions to detect movement of either visual or somatosensory cues. The question is how such attention changes the perceptual quality of the stimulus and consequently the postural response to that stimulus.