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A Comparative Study of Alternative Controls and Displays for by the Severely Physically HandicappedA modification of a row/column scanning system was investigated in order to increase the speed and accuracy with which communication aids can be accessed with one or two switches. A selection algorithm was developed and programmed in BASIC to automatically select individuals with the characteristic difficulty in controlling time dependent control and display systems. Four systems were compared: (1) row/column directed scan (2 switches); (2) row/column auto scan (1 switch); (3) row auto scan (1 switch); and (4) column auto scan (1 switch). For this sample population, there were no significant differences among systems for scan time to select the correct target. The row/column auto scan system resulted in significantly more errors than any of the other three systems. Thus, the most widely prescribed system for severely physically disabled individuals turns out for this group to have a higher error rate and no faster communication rate than three other systems that have been considered inappropriate for this group.
Document ID
Document Type
Conference Paper
Williams, D.
(Psycho-Linguistic Research Associates Menlo Park, CA, United States)
Simpson, C.
(Psycho-Linguistic Research Associates Menlo Park, CA, United States)
Barker, M.
(Children's Hospital at Stanford Palo Alto, Calif., United States)
Date Acquired
August 12, 2013
Publication Date
September 1, 1984
Publication Information
Publication: NASA. Ames Research Center 20th Ann. Conf. on Manual Control, Vol. 2
Subject Category
Man/System Technology And Life Support
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.
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