Auditory biofeedback substitutes for loss of sensory information in maintaining stance
Auditory biofeedback substitutes for loss of sensory information in maintaining stance
复制标题
DOI：
10.1007/s00221-006-0709-y
复制
发表时间：
2007-03-01
影响因子：
2
通讯作者：
Chiari, Lorenzo
中科院分区：
文献类型：
--
作者：
Dozza, Marco;Horak, Fay B.;Chiari, Lorenzo
感觉反馈对站立姿势控制的重要性从当来自前庭、躯体感觉和视觉系统的感觉信息可用时发生的平衡改善中显而易见。然而，在何种程度上也音频生物反馈（ABF）信息可以改善平衡尚未确定。也不知道为什么额外的人工感觉反馈对某些受试者比其他人更有效，在某些环境背景下比其他人更有效。本研究的目的是确定相对有效性的ABF系统，以减少姿势摇摆的立场在健康对照组和受试者与双边前庭损失，条件下减少前庭，视觉和体感输入。该ABF系统使用阈值区域和为每个个体定制的非线性缩放参数，为受试者提供其身体摇摆的音高和音量编码。当环境提供有限的视觉和体感信息时，ABF对减少双侧前庭丧失受试者的身体摇摆效果最大;当环境提供完整的体感信息时，ABF对减少双侧前庭丧失受试者的摇摆效果最小。所有受试者用ABF信息代替感觉信息的程度与每个受试者对姿势控制的视觉依赖或躯体感觉依赖的程度有关。各种感觉条件下的姿势摇摆的比较表明，患者与深刻的双侧前庭功能丧失显示大于正常的信息冗余之间的其余感官和躯干摇摆的ABF。结果支持的假设，神经系统使用增强的感觉信息不同，这取决于环境和个人倾向依赖于前庭，体感或视觉信息来控制摇摆。
The importance of sensory feedback for postural control in stance is evident from the balance improvements occurring when sensory information from the vestibular, somatosensory, and visual systems is available. However, the extent to which also audio-biofeedback (ABF) information can improve balance has not been determined. It is also unknown why additional artificial sensory feedback is more effective for some subjects than others and in some environmental contexts than others. The aim of this study was to determine the relative effectiveness of an ABF system to reduce postural sway in stance in healthy control subjects and in subjects with bilateral vestibular loss, under conditions of reduced vestibular, visual, and somatosensory inputs. This ABF system used a threshold region and non-linear scaling parameters customized for each individual, to provide subjects with pitch and volume coding of their body sway. ABF had the largest effect on reducing the body sway of the subjects with bilateral vestibular loss when the environment provided limited visual and somatosensory information; it had the smallest effect on reducing the sway of subjects with bilateral vestibular loss, when the environment provided full somatosensory information. The extent that all subjects substituted ABF information for their loss of sensory information was related to the extent that each subject was visually dependent or somatosensory-dependent for their postural control. Comparison of postural sway under a variety of sensory conditions suggests that patients with profound bilateral loss of vestibular function show larger than normal information redundancy among the remaining senses and ABF of trunk sway. The results support the hypothesis that the nervous system uses augmented sensory information differently depending both on the environment and on individual proclivities to rely on vestibular, somatosensory or visual information to control sway.