Article

A novel dual-output vocal cord vibration switch is described and
evaluated for two individuals with severe motor disabilities and complex
communication needs. An evaluative case series was performed to compare the new
device to its previously proposed single-output counterpart in terms of accuracy,
speed and user fatigue. METHOD: In an ABAB design, participants were followed for
up to 16 days as they performed several image matching tasks. Custom-written
software recorded the average time taken to match each item, as well as the total
number of selection errors. Participants reported their fatigue levels using a
modified five-point Borg scale. RESULTS: For one participant, the dual-output
version significantly decreased task completion time and selection error (p >
0.05, Kolmogorov-Smirnov test), thus improving her communication ability. For the
second participant, no significant differences were observed between the single-
and dual-output systems. Fatigue associated with illness and self-reported stress
with school exams were identified as limiting factors. CONCLUSIONS: The
dual-output vocal cord vibration switch provides a promising new alternative for
individuals with severe and multiple disabilities who are able to hum or produce
vocalizations. Both participants expressed desire to continue using the device
for educational and entertainment purposes.

Langue : ANGLAIS