The Baader-Meinhof effect, also known as frequency illusion, is the illusion in which a word, a name, or other thing that has recently come to one's attention suddenly seems to appear with improbable frequency shortly afterwards (not to be confused with the recency illusion or selection bias). It was named in 1994 after the West German Baader-Meinhof group, when a commentator on the St. Paul Pioneer Press online discussion board reported starting to hear the group's name repeatedly after learning about them for the first time.
- Zwicky, Arnold (2005-08-07). "Just Between Dr. Language and I". Language Log.
- Staff, Pacific Standard. "There's a Name for That: The Baader-Meinhof Phenomenon". Pacific Standard.