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This paper discusses about electronics-based systems that communicate directly with the human nervous system, promising radically new treatments for a variety of ailments and conditions, both physical and mental. While there is a focus on giving people better control of their prosthetic limbs, other researchers are trying to give patients better control of their emotions. One promising experiment targets depression with deep brain stimulation (DBS), in which electrodes implanted in the brain send steady pulses of electricity to certain problematic neural areas. Others are developing gear to compensate for intellectual deficits, such as a California project to build a memory-augmenting prosthetic.