Psychic nullifier (Fallout)

A psychic nullifier is a device placed on the head of a psyker to disable or prevent him or her from using his or her powers. A psychic nullifier also blocks incoming telepathic attacks when worn by a non-psyker, such as those frequently experienced in the Corridor of Revulsion. The Vault Dweller can obtain one to aid in passing through the Corridor of Revulsion on the way to the Master. It is unclear whether or not these devices were pre war creations or if they were developed by the Master during his experiments with psychic powers.