As mind reading comes closer to reality, scientists can now hear your internal voice. Sort of.

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As mind reading comes closer to reality, scientists can now hear your internal voice. Sort of.

Every couple months or so comes another breakthrough that will eventually lead to a future in which technologically based telepathy will not only be possible, but commonplace. And the next step in this technology is the ability for scientists to reconstruct words that you’re thinking with your ‘internal voice’.

Based on signals from listening patients, a computer model was used to reconstruct the sounds of words that patients were thinking of.

The method may in future help comatose and locked-in patients communicate.

Several approaches have in recent years suggested that scientists are closing in on methods to tap into our very thoughts; the current study achieved its result by implanting electrodes directly into a part of participants’ brains.

The team focused on an area of the brain called the superior temporal gyrus, or STG.

This broad region is not just part of the hearing apparatus but one of the “higher-order” brain regions that help us make linguistic sense of the sounds we hear.

The team monitored the STG brain waves of 15 patients who were undergoing surgery for epilepsy or tumours, while playing audio of a number of different speakers reciting words and sentences.

The trick is disentangling the chaos of electrical signals that the audio brought about in the patients’ STG regions.

To do that, the team employed a computer model that helped map out which parts of the brain were firing at what rate, when different frequencies of sound were played.

With the help of that model, when patients were presented with words to think about, the team was able to guess which word the participants had chosen.

They were even able to reconstruct some of the words, turning the brain waves they saw back into sound on the basis of what the computer model suggested those waves meant.

“There’s a two-pronged nature of this work - one is the basic science of how the brain does things,” said Robert Knight of UC Berkeley, senior author of the study.

“From a prosthetic view, people who have speech disorders… could possibly have a prosthetic device when they can’t speak but they can imagine what they want to say,” Prof Knight explained.

“The patients are giving us this data, so it’d be nice if we gave something back to them eventually.”

The authors caution that the thought-translation idea is still to be vastly improved before such prosthetics become a reality.