Using EMS to create haptic feedback

Zapping your forearm using electrical muscle stimulation (EMS) makes your muscle contract, meaning you have to use another muscle to counteract it, resulting in a force feedback feeling. Because the system uses just 2 wires, it can easily be miniturised and fitted to smartphones for haptic gaming.

Muscle-zapper forces gamers' own hands against them – tech – 31 January 2013 – New Scientist.

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