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Electronic devices surround us in a continuous and incessant way, either to make life more comfortable, safer or performing new ways of behaving leisure or work. The interface to these devices has evolved to simplify their use making it more intuitive and closer to the user, but is restricted to the use of fingers and/or hands (and maybe voice) as input information channel from human to the systems, and eye and/or ear as output channel (haptic feedback including the fingers or hands are also elements of output) from the systems to the human.
Citation: Muñoz LM (2011) Human Direct Interface. J Ergonom 1:e105
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