The “frequency illusion”, also called the Baader-Meinhof phenomenon
The frequency illusion, also known as the Baader-Meinhof phenomenon, occurs when something new catches our attention, leading us to believe it appears more frequently than before. This cognitive bias is rooted in selective attention and confirmation bias, where our brain filters and emphasizes stimuli that are currently significant to us. This phenomenon is a natural part of human perception, linked to evolutionary survival mechanisms, and is often triggered by emotionally or cognitively relevant stimuli.
Psychologists trace the illusion to two well-known mental shortcuts. Selective attention filters incoming information so that anything linked to a current goal or concern leaps out, while confirmation bias makes the repeated sightings feel like proof that the item truly is more common.
Evolutionarily, this heightened vigilance probably helped our ancestors notice food, threats or potential partners. Brain areas involved in perception (parietal cortex) and memory/emotion (hippocampus and amygdala) work together to spotlight the now-important stimulus.
Classic examples include spotting the same car model everywhere after deciding to buy it, hearing a newly discovered song in many places, or suddenly noticing pregnant women when parenthood is on one’s mind.
Experts interviewed by the BBC stress that the illusion is generally harmless and even adaptive; it only becomes problematic if linked to traumatic memories or if it feeds mistaken beliefs about how the world works.
Languages journal, van der Meulen M. (2022). Are We Indeed So Illuded? Recency and Frequency Illusions in Dutch Prescriptivism. DOI: 10.3390/languages7010042
Analysing Dutch style guides from 1900-2018, the author shows that writers often claim certain words or constructions are “everywhere”, yet corpus data reveal those claims are exaggerated—an empirical confirmation that frequency illusions distort language judgments.
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