Visuo-Proprioceptive Control of the Hand in Older Adults
Visuo-Proprioceptive Control of the Hand in Older Adults
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DOI：
10.1163/22134808-bja10032
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发表时间：
2020-12-01
影响因子：
1.6
通讯作者：
Sexton, Brandon M.
中科院分区：
文献类型：
--
作者：
Block, Hannah J.;Sexton, Brandon M.
为了控制手部运动，我们同时具有视觉和本体感觉或位置感。众所周知，大脑会将这些整合起来以减少方差。在这里，我们询问老年人是否像年轻人一样以最小化差异的方式整合视觉和本体感觉，以及老年受试者是否像年轻人一样补偿强加的视觉本体感觉不匹配。 10 名健康老年人（平均年龄 69 岁）和 10 名健康年轻人（平均年龄 19 岁）参与其中。受试者被要求在两只手都没有直接视力的情况下估计视觉、本体感觉和组合目标的位置。在真实的基线块之后，通过在受试者不知情的情况下将视觉成分从本体感受成分向前移动，逐渐施加空间视觉本体感受错位。老年受试者在估计视觉和本体感觉目标位置方面比年轻受试者更具可变性。与年轻受试者相比，老年受试者往往更依赖视觉而不是本体感觉。然而，视觉与本体感觉的权重与老年人和年轻人的最小方差预测相关，这表明老年人在某种程度上存在方差最小化机制。在未对准区域中，年轻和年长受试者的视觉和本体感觉重新调整相似，这表明年长受试者能够像年轻受试者一样重新调整。这些结果表明，应探索老年人完整的多感觉处理作为减轻个体感觉系统退化的潜在手段。
To control hand movement, we have both vision and proprioception, or position sense. The brain is known to integrate these to reduce variance. Here we ask whether older adults integrate vision and proprioception in a way that minimizes variance as young adults do, and whether older subjects compensate for an imposed visuo-proprioceptive mismatch as young adults do. Ten healthy older adults (mean age 69) and 10 healthy younger adults (mean age 19) participated. Subjects were asked to estimate the position of visual, proprioceptive, and combined targets, with no direct vision of either hand. After a veridical baseline block, a spatial visuo-proprioceptive misalignment was gradually imposed by shifting the visual component forward from the proprioceptive component without the subject's awareness. Older subjects were more variable than young subjects at estimating both visual and proprioceptive target positions. Older subjects tended to rely more heavily on vision than proprioception compared to younger subjects. However, the weighting of vision vs. proprioception was correlated with minimum variance predictions for both older and younger adults, suggesting that variance-minimizing mechanisms are present to some degree in older adults. Visual and proprioceptive realignment were similar for young and older subjects in the misalignment block, suggesting older subjects are able to realign as much as young subjects. These results suggest that intact multisensory processing in older adults should be explored as a potential means of mitigating degradation in individual sensory systems.