A neckband that translates thought into speech by picking up nerve signals has been used to demonstrate a "voiceless" phone call for the first time.
With careful training a person can send nerve signals to their vocal cords without making a sound. These signals are picked up by the neckband and relayed wirelessly to a computer that converts them into words spoken by a computerised voice.
"I can still talk verbally at the same time," Callahan told New Scientist. "We can differentiate between when you want to talk silently, and when you want to talk out loud." That could be useful in certain situations, he says, for example when making a private call while out in public.