In this article I talk about how to interface—literally—with the human body. Of particular focus here is electrical interfaces that have gained popularity in the HCI community over the past several years. Neural and muscular activities in the human body generate measurable, discriminable electrical signals. In medical diagnostics, measuring and analyzing these signals is common practice, as is inducing muscular activity through electrical signals. With improved signal-acquisition technologies and advances in signal processing, the electrical interface for HCI is getting more attention. Insights In 1786, Luigi Galvani stumbled across the link between muscle activity and electricity in his experiments on…
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