The ability to adjust movements to changes in the environment declines with aging. This age-related decline is caused by the decline of explicit adjustments. However, implicit adaptation remains intact and might even be increased with aging. Since proprioceptive information has been linked to implicit adaptation, it might well be that an age-related decline in proprioceptive acuity might be linked to the performance of older adults in implicit adaptation tasks. Indeed, age-related proprioceptive deficits could lead to altered sensory integration with an increased weighting of the visual sensory-prediction error. Another possibility is that reduced proprioceptive acuity results in an increased reliance on predicted sensory consequences of the movement. Both these explanations led to our preregistered hypothesis: we expected a relation between the decline of proprioception and the amount of implicit adaptation across ages. However, we failed to support this hypothesis. Our results question the existence of reliability-based integration of visual and proprioceptive signals during motor adaptation.

中文翻译：

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本体感受敏锐度会影响年轻人和老年人的内隐感觉运动适应程度吗？

随着年龄的增长，调整运动以适应环境变化的能力下降。这种与年龄相关的下降是由显性调整的下降引起的。然而，内隐适应保持不变，甚至可能随着年龄的增长而增加。由于本体感受信息与内隐适应有关，因此与年龄相关的本体感受敏锐度下降很可能与老年人在内隐适应任务中的表现有关。事实上，与年龄相关的本体感觉缺陷可能导致感觉整合改变，视觉感觉预测误差的权重增加。另一种可能性是，本体感受敏锐度的降低会导致对运动的预测感官后果的依赖增加。这两种解释都导致了我们预先注册的假设：我们预计本体感觉的下降与跨年龄的内隐适应量之间存在关系。然而，我们未能支持这一假设。我们的结果质疑在运动适应过程中是否存在基于可靠性的视觉和本体感受信号的整合。