"It isn't a bad thing, Macy. My mind is full of light."
- Luke Keegan while under the influence of a modified psychic dampener.(src)
Neural inhibitors are cybernetic implants that were used by the ConfederateGhost Program (and later, the Dominion) to control their ghost agents through keeping their aggression levels and behavioral patterns in check. They are also known as neuro-adjusters (some of which also suppress or reshape a disloyal ghost's memory and render them susceptible to orders) or psychic dampeners which weakens their powers (by extension, this includes making it easier for ghosts to screen out the thoughts of other individuals). The implants can be fatal and their method of operation is very similar to neural resocialization, but "much worse". Its implantation leaves scarred tissue.
The location of neural inhibitors can be tracked by some officers, both Confederate and Dominion.
The drawback to psychic dampeners is that they can be surgically removed or in rare cases, malfunction. Upon the defection of Sarah Kerrigan, psychic dampeners were abandoned by the Confederacy in favor of the more effective memory wipe technique. However, previously-implanted ghosts (such as Devon Starke) usually did not have their dampeners removed. Ghosts who retained them that became spectres under Project Shadow Blade had their inhibitors removed in order to avoid detection.
The Dominion utilizes both the mind wipe technique and neural inhibitors.
After the End War, the Terran Dominion developed a device that could partially undo the effects of memory alteration by delivering an electric pulse through a neural inhibitor.
Modified neural inhibitor technology continues to be used by the Church of Besainted Pelagius to enforce obedience among its disciples, the technology taken from a ghost sent to terminate the movement.