A text-based neuroprosthesis has been developed in the USA

The neuroprosthesis can convert brain signals into text.

Strokes can be a major cause of speech loss for thousands of people throughout the world. To alleviate its effects, American scientists have discovered exactly how to turn thoughts into text. To accomplish this, scientists at the University of California in San Francisco have turned to people who have had brain surgeries including both patients with normal speech and people who have lost their ability to speak.

The man who played a significant role in the experiment could not speak and had an electrode implanted in his cerebral cortex. Then, over several months, scientists monitored the patient's brain activity. So, a neural network was developed that could analyse his brain waves and then "predict" what the man was going to say.

Currently, the program has only fifty words. The list of words was compiled by scientists in advance, including expressions generally needed in everyday life. The system is 75% effective. Within just a minute, the neuroprosthesis can distinguish up to eighteen words.