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THE TRADITIONAL ”sip and puff” approach to quadriplegic wheelchair control—sucking or blowing into a straw to steer the chair—is neither convenient nor terribly hygienic. The Think-A-Move E-macc instead uses an earpiece about the size of a hearing aid that picks up pressure changes in the ear’s auditory tube, which occur when the user makes small, subtle tongue movements. Those movements can be mapped to particular commands like “speed up” or “turn right.” In trials, the Think-A-Move, designed in conjunction with engineers at Southern Illinois University, identified commands correctly 97 percent of the time, and users could talk, eat, and cough without compromising its accuracy. $5,600; think-a-move.com
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