title: A cross-sectional study examining computer task completion by adolescents with cerebral palsy across the Manual Ability Classification System levels.
abstract: OBJECTIVE
  The aim of this study was to analyze the cursor trajectories of adolescents with cerebral palsy (CP) when using a mouse for point-and-click computer tasks. By identifying some of the factors limiting cursor movement and gaining a better understanding of human movement, it will be possible to design more accessible computer interfaces.
  
  
  METHODS
  This study evaluated cursor trajectories of 29 individuals with bilateral CP who had different levels of upper limb function as measured by the Manual Ability Classification System, and compared the results with those of 12 adolescents with typical development.
  
  
  RESULTS
  Among adolescents with typical development, movement time increases linearly as the index of difficulty increases (Fitts' law); however, this linearity was not apparent in adolescents with bilateral CP.
  
  
  CONCLUSIONS
  Interfaces for members of the population are designed around Fitts' law, with low precision requirements at indices of difficulty lower than 4. We found that interactive displays for adolescents with CP should be limited to an index of difficulty of 2.
authors: Department of Mechanical Engineering, The University of Auckland, Auckland, New Zealand.
authors: T Claire
authors: TC
authors: Davies
authors: Department of Mechanical Engineering, The University of Auckland, Auckland, New Zealand.
authors: Amur
authors: A
authors: AlManji
authors: Department of Surgery, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand.
authors: N Susan
authors: NS
authors: Stott
mesh_terms: D000293:Adolescent; D002547:Cerebral Palsy / Q000145:classification / Q000150:complications*; D003201:Computers; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D019957:Motor Skills Disorders / Q000175:diagnosis* / Q000209:etiology*; D009068:Movement; D011597:Psychomotor Performance / Q000502:physiology*; D011930:Reaction Time