If you can think it, you can post it — on Twitter, that is.

A new device developed by researchers at the University of Wisconsin-Madison allows users to tell a computer what to do simply by concentrating on a letter or action on the screen.

The device relies on a brain monitoring cap. The person wearing the cap focuses on the letter they want to display and the device uses brain monitoring to tell the computer which letters to “type.”

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So far researchers are using the technology to post messages on Twitter, a network that allows users to publish messages of up to 140 characters at a time.

Researchers say the device has huge potential for people with normal brain function whose disabilities limit what their bodies can do.