This paper presented an evaluation of the LCS according to Fitts’ law (ISO/TS 9241-411:2012 standard). The tests showed the lower lip potential to control an input device, and the results showed viable throughputs (2.6 bits/s for one-direction tasks and1.06 bits/s for multidirectional task) and the most important, the lower lip achieves 62.2% of the thumb throughput, showing its potential to control human–computer interfaces. These results encourage us to expand the use of LCS to other applications (for instance controlling a power wheelchair), researching the use of other input devices that has better throughput than the joystick (to be lip-controlled) or to develop a new input device specially designed to be controlled by the lower lip. We have two new ongoing works.
1) Development and test of a new version of LCS with a mini trackball instead of a thumb joystick.
2) Evaluating the LCS to control power wheelchairs.