Brain probe
The brain probe was a device in The Adventures of Captain Proton holoprogram. It was used as a method of torture in order to gain information. 

The Twin Mistresses of Evil, Malicia and Demonica, attempted to use one on Buster Kincaid before being stopped by Captain Proton. ()

The Cradle of Persuasion was equipped with a brain probe and a pain modulator. ()

de: Gehirnsonde
The Adventures of Captain Proton
Fictional technology