Microcomputer applications for the handicapped: pre-computer assessment

Microcomputer-based augmentative communication systems often include a switch as the human-computer interface. This study investigated the feasibility of operationalizing efficiency, consistency, and reliability of svdtch activation response latency measures in order to objectively choose the best of three switches. Five subjects were assessed by a registered occupational therapist to determine: (1) optimum position in relation to the computer monitor and (2) three possible switches for each subject's use.

Data gathered from the computer assessment were used to determine mean switch activation latency for each switch, standard deviation of switch activation latency for each switch, and reliability between test days with each switch.

Results revealed that one switch resulted in significantly different mean switch activation latencies and standard deviations of the switch activation latencies for three of the five subjects. A rationale for these results is proposed and discussed.