title: Assessment of joystick control during the performance of powered wheelchair driving tasks.
abstract: BACKGROUND
  Powered wheelchairs are essential for many individuals who have mobility impairments. Nevertheless, if operated improperly, the powered wheelchair poses dangers to both the user and to those in its vicinity. Thus, operating a powered wheelchair with some degree of proficiency is important for safety, and measuring driving skills becomes an important issue to address. The objective of this study was to explore the discriminate validity of outcome measures of driving skills based on joystick control strategies and performance recorded using a data logging system.
  
  
  METHODS
  We compared joystick control strategies and performance during standardized driving tasks between a group of 10 expert and 13 novice powered wheelchair users. Driving tasks were drawn from the Wheelchair Skills Test (v. 4.1). Data from the joystick controller were collected on a data logging system. Joystick control strategies and performance outcome measures included the mean number of joystick movements, time required to complete tasks, as well as variability of joystick direction.
  
  
  RESULTS
  In simpler tasks, the expert group's driving skills were comparable to those of the novice group. Yet, in more difficult and spatially confined tasks, the expert group required fewer joystick movements for task completion. In some cases, experts also completed tasks in approximately half the time with respect to the novice group.
  
  
  CONCLUSIONS
  The analysis of joystick control made it possible to discriminate between novice and expert powered wheelchair users in a variety of driving tasks. These results imply that in spatially confined areas, a greater powered wheelchair driving skill level is required to complete tasks efficiently. Based on these findings, it would appear that the use of joystick signal analysis constitutes an objective tool for the measurement of powered wheelchair driving skills. This tool may be useful for the clinical assessment and training of powered wheelchair skills.
authors: School of Physical & Occupational Therapy, McGill University, Montréal, Canada. gianluca.sorrento@mail.mcgill.ca.
authors: Gianluca U
authors: GU
authors: Sorrento
authors: Philippe S
authors: PS
authors: Archambault
authors: François
authors: F
authors: Routhier
authors: Danielle
authors: D
authors: Dessureault
authors: Patrick
authors: P
authors: Boissy
references: Dev Med Child Neurol. 1983 Aug;25(4):472-4
references: 6225687
references: Disabil Rehabil Assist Technol. 2007 May;2(3):173-80
references: 19266637
references: Disabil Rehabil Assist Technol. 2007 May;2(3):159-68
references: 19266635
references: Arch Phys Med Rehabil. 2004 May;85(5):794-804
references: 15129405
references: Phys Med Rehabil Clin N Am. 2010 Feb;21(1):111-25
references: 19951781
references: Arch Phys Med Rehabil. 2004 Jan;85(1):41-50
references: 14970966
references: Disabil Rehabil. 2003 Mar 18;25(6):286-90
references: 12623619
references: Dev Med Child Neurol. 1982 Jun;24(3):366-71
references: 6212277
references: Disabil Rehabil Assist Technol. 2007 May;2(3):169-72
references: 19266636
references: Disabil Rehabil. 2007 Jun 15-30;29(11-12):969-72
references: 17577731
references: Disabil Rehabil Assist Technol. 2009 May;4(3):198-207
references: 19241234
references: Arch Phys Med Rehabil. 1984 Feb;65(2):95-7
references: 6230066
references: Assist Technol. 2007 Fall;19(3):143-53
references: 17937056
references: Dev Med Child Neurol. 2001 Nov;43(11):769-77
references: 11730152
references: Arch Phys Med Rehabil. 2010 Apr;91(4):596-601
references: 20382293
references: J Rehabil Res Dev. 1997 Jan;34(1):58-71
references: 9021626
references: IEEE Trans Syst Man Cybern B Cybern. 2010 Oct;40(5):1331-42
references: 20106745
references: Am J Occup Ther. 1990 Dec;44(12):1125-9
references: 2278294
references: Arch Phys Med Rehabil. 2002 Jan;83(1):10-8
references: 11782826
references: J Rehabil Res Dev. 1997 Apr;34(2):vi
references: 9108340