Using thought to control machines
Brain-computer interfaces may change what it means to be human
![](https://www.economist.com/cdn-cgi/image/width=1424,quality=80,format=auto/sites/default/files/images/print-edition/20180106_LDD001_1.jpg)
TECHNOLOGIES are often billed as transformative. For William Kochevar, the term is justified. Mr Kochevar is paralysed below the shoulders after a cycling accident, yet has managed to feed himself by his own hand. This remarkable feat is partly thanks to electrodes, implanted in his right arm, which stimulate muscles. But the real magic lies higher up. Mr Kochevar can control his arm using the power of thought. His intention to move is reflected in neural activity in his motor cortex; these signals are detected by implants in his brain and processed into commands to activate the electrodes in his arms.
This article appeared in the Leaders section of the print edition under the headline “The next frontier”
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