title: Speed-accuracy testing on the Apple iPad provides a quantitative test of upper extremity motor performance in children with dystonia.
abstract: The currently available scales for quantitative measurement of the severity of childhood dystonia require human observer ratings and provide poor granularity in the scores for individual limbs. We evaluated the use of new-generation high-quality touchscreens (an iPad) according with the Fitts law, which is a mathematical model that takes into account the relation between movement time and the task accuracy. We compared the abilities of healthy subjects and children with dystonia. The linear relation described by Fitts law held for all the groups. The movement time and the information transmitted were age and severity related. Our results provide evidence for the usability and validity of using Fitts law as a quantitative diagnostic tool in children with dystonia. Furthermore, testing on touchscreen tablets may help to guide the design of user interfaces to maximize the communication rate for children who depend upon assistive communication devices.
authors: Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA.
authors: Matteo
authors: M
authors: Bertucco
authors: Departments of Biomedical Engineering, Child Neurology, and Biokinesiology, University of Southern California, Los Angeles, CA, USA Children's Hospital of Los Angeles, Los Angeles, CA, USA tsanger@usc.edu.
authors: Terence D
authors: TD
authors: Sanger
mesh_terms: D000293:Adolescent; D001696:Biomechanical Phenomena; D002648:Child; D003201:Computers; D020821:Dystonic Disorders / Q000175:diagnosis* / Q000503:physiopathology; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D063731:Mobile Applications; D008954:Models, Biological; D009043:Motor Activity / Q000502:physiology; D012720:Severity of Illness Index; D013647:Task Performance and Analysis; D034941:Upper Extremity / Q000503:physiopathology
keywords: Fitts law; dystonia; human-computer interaction; iPad®; reaching; transmission of information
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