Frequency illusion, also known as the Baader–Meinhof phenomenon, is a cognitive bias in which, after noticing something for the first time, there is a tendency to notice it more often, leading someone to believe that it has a high frequency (a form of selection bias). It occurs when increased awareness of something creates the illusion that it is appearing more often. Put plainly, the frequency illusion is when "a concept or thing you just found out about suddenly seems to crop up everywhere." It was named after an incidence of frequency illusion in which the Baader–Meinhof Group was mentioned. The Baader–Meinhof phenomenon was originally noticed by a  Terry Mullen, who in 1994 wrote a letter to a newspaper column in which he mentioned that he had first heard of the Baader–Meinhof Group, and shortly thereafter coincidentally came across the term from another source. After the story was published, readers continued to submit their own experiences of similar events, and the phenomenon was named the Baader–Meinhof phenomenon  .
Frequency illusion, also known as the Baader–Meinhof phenomenon, is a cognitive bias in which, after noticing something for the first time, there is a tendency to notice it more often, leading someone to believe that it has a high frequency (a form of selection bias). It occurs when increased awareness of something creates the illusion that it is appearing more often. Put plainly, the frequency illusion is when "a concept or thing you just found out about suddenly seems to crop up everywhere." The name "Baader–Meinhof phenomenon" was derived from a particular instance of frequency illusion in which the Baader–Meinhof Group was mentioned. In this instance, it was noticed by a man named Terry Mullen, who in 1994 wrote a letter to a newspaper column in which he mentioned that he had first heard of the Baader–Meinhof Group, and shortly thereafter coincidentally came across the term from another source. After the story was published, various readers submitted letters detailing their own experiences of similar events, and the name " Baader–Meinhof phenomenon " was coined as a result .
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