MULTISENSORY INTEGRATION AND HUMAN POSTURAL CONTROL

这项研究的长期目标是了解多感官 输入在人直立姿势的控制中相互作用， 中枢或中枢神经系统的姿势性后果的理论基础 外周感觉缺失 为了保持直立， 知道不同身体部位的相对位置，包括 相对于周围环境的质心。 我们如何 构建这样一个内部模型是未知的，但被认为是 严重依赖于我们身体的多感官信息 段和周围的环境。 这个重大问题 各种感觉输入如何相互作用以控制姿势， 悬而未决 我们建议同时操纵视觉和 体感刺激，并分析多感觉之间的耦合 信息和姿势摇摆。 具体目标是：1. 建立 多感官整合是基于形成稳定的空间 姿势摇摆和多感觉之间的时间关系 信息.. 我们将操纵时空结构 视觉和躯体感觉信息，并研究 多感官刺激和姿势摇摆之间的耦合。 是 耦合依赖于模式（视觉与体感）或 感觉输入的属性（空间，时间）？ 2. 研究如何 多感官信息的感官融合是在姿势中实现的。 控制 我们将实验性地“拉开”两个感官输入， 呈现出不同的时间结构。 然后我们将 分析姿势摇摆和多感觉之间的耦合 观察多感官信息是如何融合的， 可以选择单个感觉源。 3. 为了研究 对多感官信息的姿势适应。 姿势反应 视觉或躯体感觉输入频率的突然变化 将与两种刺激的变化进行比较。 如何 姿势控制系统适合于多感官信息， 单一刺激？ 这种适应的时间进程是什么？ 4. 到 研究任务依赖对多感觉整合的影响。 我们将研究如何耦合的姿势摇摆多感官 信息受到指令的影响，以检测 视觉或躯体感觉线索。 问题是这种关注 改变了刺激的感知质量， 对刺激的姿势反应。

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.