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Advancements in power wheelchair joystick technology : effects of isometric joysticks and signal conditioning on driving performance
DICIANNO BE; SPAETH D; FITZGERALD SG; BONINGER ML
AM J PHYS MED REHABIL , 2006, vol. 85, n° 8, p. 631-639 Doc n°: 125618 Localisation : Documentation IRR Descripteurs : KF6 - FAUTEUIL ROULANT, JL32 - CONDUITE AUTOMOBILE 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. DESIGN: 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). RESULTS: 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. CONCLUSIONS: VGA software allowed the IJ to function similarly to the MSJ with respect to RT, MT, and DA. Langue : ANGLAIS |
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