Being Neuralyzed is the result of seeing the flash from the Neuralyzer. When someone is neuralyzed, they lose their entire memory up to a certain point, set through the use of dials on the Neuralyzer itself. This is essential for the MiB, as they can make witnesses forget the aliens that they may have seen or came in contact with. The MiB do not use this sparingly, neuralyzing almost everybody they talk to. The results of the neuralyzer are meant to be permanent, but can be reversed with a De-Neuralyzer, which is not as simple of a process.