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Robert Chmielewski has had quadriplegia (四肢瘫痪) since his teens. Sensors implanted (植入) in his brain read his thoughts to control two robotic arms, which helps him to perform daily tasks. Now he can use one robotic arm to control a knife and the other a fork.

Modern technology can reach inside someone’s head and pull out what he is thinking. Maybe he intends to move a robotic arm or type something on a computer screen. Such thought-controlled devices can help people who aren’t able to move or perform different tasks and promote the well-being of the disabled.

Decoding (解码) thought usually requires placing sensors directly on or in someone’s brain. Those implanted sensors can catch the electrical signals passing between the person’s brain cells, or neurons. Such signals carry messages that allow brains to think, feel and control the body.

Using brain implants, researchers have picked up electrical signals in the brain linked to certain words or letters. This has allowed brain implants to transform thoughts into text or speech on a computer. Likewise, brain implants have transformed imagined handwriting into text on a screen. Implanted sensors have even allowed scientists to turn the signals they caught that are associated with a song in someone’s head into real music.

In a recent study, scientists decoded full stories from people’s brains using MRI scans (磁共振成像扫描). This did not require any brain implants. But building the thought decoder did require many hours of brain scans for each person. What’s more, the system only worked on the person whose brain scans helped build it and only when that person was willing to have their mind read.

So devices that might let someone secretly read your mind from across the room are still a long, long way off. Still, it’s clear that mind-reading tech is getting more advanced. As it does, scientists are thinking hard about what it would mean to live in a world where not even the inside of your head is completely private.