Unit of Rehabilitation Sciences, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
Department of Rehabilitation, Yokosuka Kyosai Hospital, Yokosuka, Japan.
Somatosens Mot Res. 2020 Dec;37(4):313-319. doi: 10.1080/08990220.2020.1830755. Epub 2020 Oct 16.
Mechanisms underlying the somatosensory temporal discrimination threshold and its relationship with motor control have been reported; however, little is known regarding the change in temporal processing of tactile information during motor learning. We investigated the somatosensory temporal discrimination threshold changes during motor learning in a feedback-control task.
We included 15 healthy individuals. The somatosensory temporal discrimination threshold was measured on the index finger. A 10-session coin rotation task was performed, with 2 min' training per session. The coin rotation scores were determined through tests (continuous coin rotation at 180° at maximum speed for 10 s). The coin rotation test score and the somatosensory temporal discrimination threshold were determined at baseline and after 5 and 10 sets of training, as follows: pre-test; training (1 set × 5); post-test; training (1 set × 5); and post-test. The coin rotation score and the somatosensory temporal discrimination threshold were compared between the tests. The latter was also compared between the right (the within-subject control) and left fingers.
The coin rotation score showed significant differences among all tests. In the somatosensory temporal discrimination threshold, there was a significant difference between the pre-test and post-test values, pre-test and post-test values of the left side and between the right and left sides in the post-test and the post-test values.
The somatosensory temporal discrimination threshold decreased along with task-performance progress following motor learning during a feedback-control task.
已经报道了躯体感觉时间辨别阈值及其与运动控制之间的关系的机制；然而，对于运动学习期间触觉信息的时间处理变化知之甚少。我们研究了在反馈控制任务中运动学习期间躯体感觉时间辨别阈值的变化。
我们纳入了 15 名健康个体。在食指上测量躯体感觉时间辨别阈值。进行了 10 次硬币旋转任务，每次训练 2 分钟。通过测试（以最大速度连续旋转硬币 180°，持续 10 秒）确定硬币旋转分数。在基线以及 5 组和 10 组训练后，进行了硬币旋转测试和躯体感觉时间辨别阈值测试，具体如下：预测试；训练（1 组×5 次）；后测试；训练（1 组×5 次）；后测试。比较了测试之间的硬币旋转分数和躯体感觉时间辨别阈值。还比较了右侧（个体内对照）和左侧手指之间的后者。
所有测试之间的硬币旋转分数均存在显著差异。在躯体感觉时间辨别阈值方面，预测试和后测试值之间、预测试和后测试左侧值之间以及后测试和后测试右侧值之间存在显著差异。
在反馈控制任务中进行运动学习后，随着任务表现的进展，躯体感觉时间辨别阈值下降。
