- Star Trek: The Motion Picture
- Star Trek II: The Wrath of Khan
- Star Trek III: The Search for Spock
- Star Trek IV: The Voyage Home
- Star Trek V: The Final Frontier
- Star Trek VI: The Undiscovered Country
- Star Trek Generations
Invented by Doctor Simon Van Gelder in 2266, the purpose of this device was to aid rehabilitation of criminals through the specific removal of thoughts related to their criminal acts.
The device was discovered to have detrimental effects, however, if used without proper supervision and care.