A high-tech prosthetic hand developed by the Scottish company Touch Bionics -- with 24 grip patterns controlled by an iPhone app -- has triggered a debate about whether the swift advance of robotic limbs and neural implants is leading us toward a transhuman or posthuman society. Advanced prostheses, including some that incorporate a sense of touch, as well as drug that enhance human performance and 3D printers that could someday replicate human organs could transform what is considered normal for human health and performance, experts say. "The question is, as the technology gets better, will it become the norm to have one of these, and what will people go through to get one?" asked i-limb wearer Bertolt Meyer.

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