The frequency illusion (also known as the Baader–Meinhof phenomenon) is a cognitive bias in which a person notices a specific concept, word, or product more frequently after recently becoming aware of it.
The name was coined in 1994 by Terry Mullen in a letter to the St. Paul Pioneer Press. The letter describes how, after mentioning the name of the German militant group Baader–Meinhof once, he kept noticing it. This led to other readers sharing their own experiences of the phenomenon, leading it to gain recognition. It was not until 2005, when Stanford linguistics professor Arnold Zwicky wrote about this effect on his blog, that the name "frequency illusion" was coined.
Several possible causes behind frequency illusion have been put forth. However, the consensus seems to be that the main processes behind this illusion are other cognitive biases and attention-related effects that interact with frequency illusion. Zwicky considered this illusion a result of two psychological processes: selective attention and confirmation bias.
https://en.wikipedia.org/wiki/Frequency_illusion
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