Device allows people to type with their mind

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A newly-developed brain-computer (BCI) interface allows people with severe limb weakness to type, using their minds, at speeds approaching normal. The participants each had an electrode array around the size of a baby aspirin implanted in their brains. The array recorded signals from the motor cortex, the region of the brain controlling muscle movement. Following the surgery, the participants were encouraged to visualise the arm, hand and finger movements involved in typing. The resulting neural signals were then translated by algorithms into point and click commands that were used to guide a cursor on an onscreen keyboard. Similar techniques using…

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