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More than four million Americans who have such complex disabilities that they cannot meet their communication needs through their own speech can benefit from the use of aided Augmentative and Alternative Communication, or AAC, which is the use of computers, tablets or mobile devices to supplement or replace speech or writing. According to Penn State researchers, deciding which hand to use for communication-aiding technology is a cognitive task that can slow the user down, potentially inhibiting communication and performance.

Scientists are working to improve communication-aiding technologies

In excess of four million Americans who have such complex inabilities that they can't meet their correspondence needs through their own discourse can profit...