A pill-sized silicone array containing 100 electrodes thinner than a hair connects to 100 gold wires extending through a person's scalp in a BrainGate sensor device that translates brain waves into commands for mechanical devices such as prosthetics. In the future, a flexible housing of silicone, polyurethane or other biocompatible material may be used to help establish the brain-machine interface that makes mental control of robotics possible.

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