...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Experimental Brain Research >The coordination of hand transport and grasp formation during single- and double-perturbed human prehension movements
【24h】

The coordination of hand transport and grasp formation during single- and double-perturbed human prehension movements

机译：单次和两次摄动的人类理解运动中的手部运输和抓地力形成的协调

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We investigated the mechanisms underlying human prehension movements, by perturbing the size and position of virtual targets. Subjects grasped virtual target discs with thumb and index finger. In 25% of trials, target size or position (single perturbation), or both (double perturbation) were changed 300 ms after target appearance. The experiments were designed such that the kinematic profiles of grasp formation and hand transport had a similar shape, and were analysed by the same algorithm. We found that grasp kinematics were influenced by changes of target position, and transport kinematics by changes of target size; we also found that the kinematics of double-perturbation trials could not be explained as a linear combination of single-perturbation effects. These findings confirm and expand previous evidence against the view that grasp and transport are controlled by fully independent channels. Most importantly, we found that the time of correction onset was not the same for grasp and transport, neither in single- nor in double-perturbation trials. This outcome argues against a holistic (single-channel) model of prehension; instead, our data are consistent with the notion of two mutually coupled channels.
机译：我们通过干扰虚拟目标的大小和位置，研究了人类抢先运动的潜在机制。受试者用拇指和食指抓住了虚拟靶盘。在25％的试验中，目标出现后300毫秒改变了目标大小或位置（单次扰动）或两者（两次扰动）。设计实验时应使抓握形成和手部运动的运动轮廓具有相似的形状，并使用相同的算法进行分析。我们发现，抓紧运动学受目标位置变化的影响，运输运动学受目标大小的变化影响；我们还发现，不能将双摄动试验的运动学解释为单摄动效应的线性组合。这些发现证实并扩大了先前的证据，反对认为把握和运输受完全独立的渠道控制的观点。最重要的是，我们发现，在一次和两次摄动试验中，抓握和运输的矫正开始时间都不相同。这一结果与整体（单渠道）的理解模型背道而驰。相反，我们的数据与两个相互耦合的通道的概念一致。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号