Dicianno Brad E, Spaeth Donald M, Cooper Rory A, Fitzgerald Shirley G, Boninger Michael L
Human Engineering Research Laboratories, Department of Physical Medicine and Rehabilitation, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
Am J Phys Med Rehabil. 2006 Aug;85(8):631-9. doi: 10.1097/01.phm.0000228519.54763.b4.
An estimated 125,000 Americans with movement disorders that preclude independent mobility in a power wheelchair could benefit from improved control devices. We developed variable gain algorithm (VGA) software for our isometric joystick (IJ) that allows it to emulate a commercially available motion-sensing joystick (MSJ) in performance but retain the unique customizable features of an isometric control. Force sensing algorithm (FSA) software allowed the IJ to function as a simple isometric device.
Using a Fitts' Law paradigm, we compared driving performance with floor targets using a standard MSJ and an IJ with both FSA and VGA software in 11 electric power wheelchair users with a variety of impairments. Outcome measures were reaction time (RT), movement time (MT), and driving accuracy (DA).
The IJ with FSA had a significantly shorter RT than the MSJ (P < 0.0020). The IJ with FSA had a significantly longer MT than the MSJ to far targets (P < 0.0159). No differences were found between the IJ with VGA and the MSJ with respect to RT or MT. No differences in DA were found among any of the joysticks.
VGA software allowed the IJ to function similarly to the MSJ with respect to RT, MT, and DA.
据估计，12.5万患有运动障碍而无法独立操作电动轮椅的美国人可能会从改进的控制设备中受益。我们为等轴测操纵杆（IJ）开发了可变增益算法（VGA）软件，使其在性能上能够模拟市售的运动感应操纵杆（MSJ），同时保留等轴测控制独特的可定制功能。力感应算法（FSA）软件使IJ能够作为一个简单的等轴测设备运行。
采用菲茨定律范式，我们在11名患有各种损伤的电动轮椅使用者中，比较了使用标准MSJ以及配备FSA和VGA软件的IJ驶向地面目标的驾驶性能。结果测量指标为反应时间（RT）、移动时间（MT）和驾驶准确性（DA）。
配备FSA的IJ的RT显著短于MSJ（P < 0.0020）。配备FSA的IJ驶向远处目标的MT显著长于MSJ（P < 0.0159）。配备VGA的IJ与MSJ在RT或MT方面未发现差异。在任何操纵杆之间，DA均未发现差异。
VGA软件使IJ在RT、MT和DA方面的功能与MSJ相似。
