Analysis of position and isometric joysticks for powered wheelchair driving.
The control interface is one of the most critical components of the electric-powered wheelchair (EPW). The control interface must accommodate the user's limitations and maximize the user's abilities. This study extended Fitts' Law for target-acquisition to a continuously updated target. The extended Fitts' Law was used to examine EPW driving with a standard position sensing joystick and a prototype isometric joystick (IJ). The extended Fitts' Law provides insight into the difficulty of performing target-acquisition tasks with an EPW. The test results showed significant differences (p < 0.05) among the two types of joysticks for selected measures of information processing capacity, movement time, root-mean-square-error, and average velocity while performing turning maneuvers. The mean values indicate that the IJ may provide superior turning performance.
Cooper
R A
RA
Department of Rehabilitation Science, University of Pittsburgh, PA 15206, USA. rcooper+@pitt.edu
Jones
D K
DK
Fitzgerald
S
S
Boninger
M L
ML
Albright
S J
SJ
D000465:Algorithms; D001698:Biomedical Engineering; D004560:Electricity; D004867:Equipment Design; D006801:Humans; D014910:Wheelchairs