Marks R
Department of Biobehavioral Studies, Teachers College, Columbia University, New York, New York 10027, USA.
Biomed Sci Instrum. 1997;34:386-91.
This study examined the effect of occluding static vision on the ability of persons with knee joint disease and impaired position sense to actively reproduce knee angles in a one-legged standing position. The subjects, six women with knee joint disease, ages 54-75 years each performed a series of two knee repositioning tasks in the ranges of 20-40 degrees flexion on two different occasions, both with, and without visual feedback. On each occasion, the leg was marked with reflective markers and the resultant sagittal plane knee angles were photographed. Whilst the absolute differences between the criterion and the matching knee angles calculated from these records showed vision to have an effect on positioning accuracy (p = 0.04), there were no differences in mean absolute constant errors between the two experimental paradigms, indicating similar perceptual judgment in memory. However, variability in performance tended to be greater when vision was occluded (p = 0.08). These findings suggest that while visual sources of information may play a minor role in the knee positioning bias towards target overestimation apparent in this group, supplementary visual cues may help to promote more consistent positioning performance.
本研究考察了遮挡静态视觉对膝关节疾病且位置觉受损的人在单腿站立位主动重现膝关节角度能力的影响。受试者为6名患有膝关节疾病的女性，年龄在54 - 75岁之间，她们在两种不同情况下，分别在有视觉反馈和无视觉反馈的条件下，进行了一系列两次膝关节重新定位任务，膝关节屈曲范围为20 - 40度。每次测试时，腿部都用反光标记进行标记，并拍摄由此产生的矢状面膝关节角度。虽然从这些记录中计算出的标准膝关节角度与匹配膝关节角度之间的绝对差异表明视觉对定位准确性有影响（p = 0.04），但两种实验范式之间的平均绝对恒定误差没有差异，这表明在记忆中的感知判断相似。然而，当遮挡视觉时，表现的变异性往往更大（p = 0.08）。这些发现表明，虽然视觉信息源可能在该组中明显存在的膝关节向目标高估的定位偏差中起次要作用，但补充视觉线索可能有助于促进更一致的定位表现。
