Visual contribution to postural stability: Interaction between target fixation or tracking and static or dynamic large-field stimulus
Visual contribution to postural stability: Interaction between target fixation or tracking and static or dynamic large-field stimulus
复制标题
DOI：
10.1016/j.gaitpost.2009.08.241
复制
发表时间：
2010-01-01
期刊：
影响因子：
2.4
通讯作者：
Straumann, D.
中科院分区：
文献类型：
--
作者：
Laurens, J.;Awai, L.;Straumann, D.
静止的视觉信息对姿态具有稳定作用，而移动的视觉信息则具有不稳定作用。我们比较了静止或移动注视点对静止或移动大视场刺激的影响，以及注视点和大视场刺激之间的相互作用。我们记录了20名健康受试者在固定或振荡点（垂直或水平运动，1/3 Hz， +/-12度振幅，距离96 cm）时的身体摆动。此外，大视场随机点图案（延伸：类似于80 x 70度）是静止的，移动的或不存在的。与完全黑暗的情况相比，在黑暗中固定一个静止点的视觉固定不会减少前后（AP）摇摆，但在低于0.5 Hz的频率下会略微减少侧向摇摆。相比之下，在固定的大视场模式上固定一个固定的点可以减少所有频率（0.1-2 Hz）的AP和侧体摆动。眼动追踪振荡点在1/3 Hz即刺激频率处引起身体摆动的峰值，但在该频率处没有大视场刺激的影响。然而，与在黑暗中跟踪一个移动的点相比，在一个固定的大视场模式下，当受试者跟踪一个移动的点时，在0.1到2赫兹之间的频率上，AP和横向摆动会减少。我们的研究结果表明，无论眼睛是盯着一个静止的目标还是跟踪一个移动的目标，静止的大视场图案在所有条件下都具有稳定效果。(C) 2009 Elsevier b.v.版权所有
Stationary visual information has a stabilizing effect on posture, whereas moving visual information is destabilizing. We compared the influence of a stationary or moving fixation point to the influence of stationary or moving large-field stimulation, as well as the interaction between a fixation point and a large-field stimulus. We recorded body sway in 20 healthy subjects who were fixating a stationary or oscillating dot (vertical or horizontalmotion, 1/3 Hz, +/-12 degrees amplitude, distance 96 cm). In addition, a large-field random dot pattern (extension: similar to 80 x 70 degrees) was stationary, moving or absent. Visual fixation of a stationary dot in darkness did not reduce antero-posterior (AP) sway compared to the situation in total darkness, but slightly reduced lateral sway at frequencies below 0.5 Hz. In contrast, fixating a stationary dot on a stationary large-field pattern reduced both AP and lateral body sway at all frequencies (0.1-2 Hz). Ocular tracking of the oscillating dot caused a peak in body sway at 1/3 Hz, i.e. the stimulus frequency, but there was no influence of large-field stimulus at this frequency. A stationary large-field pattern, however, reduced AP and lateral sway at frequencies between 0.1 and 2 Hz when subjects tracked a moving dot, compared to tracking in darkness. Our results demonstrate that a stationary large-field pattern has a stabilizing effect in all conditions, independent of whether the eyes are fixing on a stationary target or tracking a moving target. (C) 2009 Elsevier B. V. All rights reserved.