The Neural Inhibitor is a piece of equipment designed by William Stryker to suppress the mental abilities of telepaths. Used on Professor X while he was held captive at Stryker's base underneath Alkali Lake. The device was developed to prevent telepathic mutants from reading the minds of others. It was also used to make Professor X vulnerable to Jason Stryker's illusions. Once Xavier was firmly under Jason's control, the device was no longer needed.