Effects of galvanic vestibular stimulation during human walking
Effects of galvanic vestibular stimulation during human walking
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DOI：
10.1111/j.1469-7793.1999.0931s.x
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发表时间：
1999-06-15
影响因子：
5.5
通讯作者：
Taylor, JL
中科院分区：
文献类型：
--
作者：
Fitzpatrick, RC;Wardman, DL;Taylor, JL
1.为了确定前庭对人类calking的影响，前庭电刺激被施加到正常成年受试者，因为他们走到以前看到的目标。当受试者开始行走时，经乳突阶梯刺激开始。闭上眼睛时，电流刺激引起大的转向，转向有阳极电流的一侧.通过引导被蒙眼受试者从一个任意点到另一个任意点，无论是步行还是坐在轮椅上，来测量在没有视觉线索的情况下感知步态轨迹的能力。到达目的地位置并摘下眼罩后，受试者用手指指示开始位置。受试者在估计轨迹时会出现相当大的误差，但无论是在轮椅上还是在走路时，都同样准确。为了确定前庭刺激对轨迹感知的影响，将电流刺激施加到被蒙住眼睛的受试者，因为他们在轮椅上从一个点引导到另一个点。前庭刺激产生了一个虚幻的移动轨迹。这种移动是朝着阴极的一侧，即在相反的方向上由行走过程中的刺激产生的转向。我们的结论是，在行走过程中的前庭电刺激会导致受试者从他们的计划轨迹。在某种程度上，这种改变的过程可以补偿刺激产生的轨迹感知的改变。然而，改变垂直或基础的支持，或直接前庭离腿肌肉的影响可能有助于步态的变化。
1. To identify vestibular influences on human calking, galvanic vestibular stimulation was applied to normal adult subjects as they walked to a previously seen target. A transmastoidal step stimulus commenced as subjects started walking. With the eyes shut, the galvanic stimulus caused large turns towards the side with the anodal current.2. Ability to perceive the trajectory of gait without visual cues was measured by guiding blindfolded subjects from one arbitrary point to another, either walking or seated in a wheelchair. On reaching a destination position and removing the blindfold, subjects pointed to indicate the starting position. Subjects made considerable errors in estimating the trajectory, but were equally accurate whether in the wheelchair or walking.3. To determine the effects of vestibular stimulation on the perception of trajectory the galvanic stimulus was applied to blindfolded subjects as they were guided from one point to another in the wheelchair. The vestibular stimulus produced an illusory shift in the trajectory travelled. This shift was towards the side with the cathode, i.e, in the opposite direction to the turn produced by the stimulus during walking.4. We conclude that galvanic vestibular stimulation during walking causes subjects to turn from their planned trajectory. In part, this altered course may compensate for an altered perception of trajectory produced by the stimulus. However, altered perception of the vertical or the base of support, or direct vestibulo-fugal influences on the leg muscles could contribute to the changes in gait.