Schaefer S Y, Hengge C R
Motor Rehabilitation and Learning Laboratory, Utah State University, 7000 Old Main Hill, Logan, UT, 84322, USA.
Department of Physical Therapy, University of Utah, 520 Wakara Way, Salt Lake City, UT, 84108, USA.
Exp Brain Res. 2016 Jan;234(1):229-40. doi: 10.1007/s00221-015-4454-y. Epub 2015 Oct 5.
Point-to-point reaching has been widely used to study upper extremity motor control. We have been developing a naturalistic reaching task that adds tool manipulation and object transport to this established paradigm. The purpose of this study was to determine the concurrent validity of a naturalistic reaching task in a sample of healthy adults. This task was compared to the criterion measure of standard point-to-point reaching. Twenty-eight adults performed unconstrained out-and-back movements in three different directions relative to constant start location along midline using their nondominant arm. In the naturalistic task, participants manipulated a tool to transport objects sequentially between physical targets anchored to the planar workspace. In the standard task, participants moved a digital cursor sequentially between virtual targets, veridical to the planar workspace. In both tasks, the primary measure of performance was trial time, which indicated the time to complete 15 reaches (five cycles of three reaches/target). Two other comparator tasks were also designed to test concurrent validity when components of the naturalistic task were added to the standard task. Spearman's rank correlation coefficients indicated minimal relationship between the naturalistic and standard tasks due to differences in progressive task difficulty. Accounting for this yielded a moderate linear relationship, indicating concurrent validity. The comparator tasks were also related to both the standard and naturalistic task. Thus, the principles of motor control and learning that have been established by the wealth of point-to-point reaching studies can still be applied to the naturalistic task to a certain extent.
点对点够物已被广泛用于研究上肢运动控制。我们一直在开发一种自然主义的够物任务，该任务在这一既定范式中增加了工具操作和物体运输。本研究的目的是确定自然主义够物任务在健康成年人样本中的同时效度。将该任务与标准点对点够物的标准测量方法进行比较。28名成年人使用其非优势手臂，相对于沿中线的固定起始位置，在三个不同方向上进行无约束的来回运动。在自然主义任务中，参与者操纵工具在固定于平面工作空间的物理目标之间依次运输物体。在标准任务中，参与者在与平面工作空间垂直的虚拟目标之间依次移动数字光标。在这两个任务中，主要的绩效指标是试验时间，即完成15次够物（三个目标各够物五次的五个循环）所需的时间。还设计了另外两个比较任务，以测试当自然主义任务的组成部分添加到标准任务中时的同时效度。由于渐进任务难度的差异，斯皮尔曼等级相关系数表明自然主义任务和标准任务之间的关系最小。考虑到这一点产生了适度的线性关系，表明具有同时效度。比较任务也与标准任务和自然主义任务相关。因此，大量点对点够物研究所确立的运动控制和学习原则在一定程度上仍可应用于自然主义任务。
