PsychologicalDUAL-USE

Frequency Illusion

What it is

After you learn or notice something new, it seems to appear everywhere — a product of selective attention and confirmation bias, not of any change in the world.

How it works

The linguist Arnold Zwicky named the frequency illusion in 2005 for a pattern among people newly aware of a usage: having noticed it once, they reported it as suddenly rampant. The popular name, the Baader-Meinhof phenomenon, comes from a 1994 newspaper discussion board where a reader described hearing about the German group twice in one day. Two mechanisms combine. Selective attention makes the newly learned item salient, so instances that were always present are now registered — Simons and Chabris's gorilla shows how completely unattended things vanish — and confirmation bias counts the hits and ignores the stretches of absence. The result is a felt increase in frequency with no actual change and, through the availability heuristic, a felt increase in importance. The illusion is engineered wherever a persuader wants something to seem sudden or everywhere. Brand seeding and retargeting put a product in front of you after you first look, so the illusion and a real increase reinforce each other; moral panics and crime-wave narratives rely on a newly named category — a drug, a threat, a type of person — after which every case is noticed and counted; and once you are told your partner “always” does something, you see every instance.

Real-world examples

  • •Zwicky (2005) coined the term on Language Log after noticing that readers who had just learned about a construction — “between you and I”, for instance — began reporting it as newly everywhere, when the usage was centuries old.
  • •The name Baader-Meinhof phenomenon comes from a 1994 post to the St. Paul Pioneer Press online discussion board by a reader who had encountered the group's name twice within a day after never having heard it; the label stuck because readers immediately began seeing it everywhere.
  • •Retargeting advertising exploits the illusion and manufactures its object at once: after you look at a pair of shoes, the shoes follow you across sites and feeds, and the sense that “everyone is talking about” the brand is partly attention and partly a purchased increase.
  • •Crime-wave and social-contagion narratives on every side depend on the mechanism: once a category is named and salient — the 2013 “knockout game” coverage, reports of a hate-crime wave after 2016, the 2022 “rainbow fentanyl” alarm — each case is noticed and reported as evidence of a surge. Whether the underlying rate changed in each instance is an empirical question the noticing cannot answer.
  • •People who have just bought a car, received a diagnosis, or become pregnant report the car, the condition, or pregnant women everywhere; the world has not changed, their attention has, and the same experience makes a newly heard vaccine side-effect story feel like an epidemic.
  • •Once a friend tells you that a colleague “always interrupts”, you notice every interruption and none of the turns they waited; the accusation installs a filter that then confirms it.

Ethical guidelines

Where the line is

Drawing attention to something real so that people notice it is ordinary communication; the line is crossed when a persuader names and dramatizes a category, or purchases ubiquity through seeding and retargeting, so that the audience's newly tuned attention supplies a surge or a consensus the actual rate does not.

  • ●When you claim something is suddenly everywhere or on the rise, cite the rate; a wave that exists only in noticing is not a wave.
  • ●Do not name and dramatize a category in order to harvest the illusion — every subsequent case will be counted for you, and the count will be wrong.
  • ●Retargeting and seeding are legitimate when disclosed as advertising; presenting purchased ubiquity as organic buzz is not.
  • ●When you draw someone's attention to a pattern in another person, ask yourself whether you are reporting a frequency or installing a filter.

How to defend against it

  • ►Ask whether the frequency is new or your attention is: before you accept that something is surging, find a count that predates your noticing — Google Trends, official statistics, a dated archive.
  • ►Keep a tally for a week when you feel something is “everywhere”; recorded frequency reliably disappoints the felt one.
  • ►When you have just learned a term, expect to see it constantly for a while, and discount that stretch of evidence accordingly.
  • ►Separate the ad from the world: if a product seems to be everywhere right after you searched for it, that is retargeting, not popularity.
  • ►When someone tells you a person “always” does something, look for the instances that do not fit before agreeing; the filter is easier to notice before it is installed.

References

  1. Zwicky, A. (2005). Just between Dr. Language and I. Language Log, 7 August 2005
    The coinage of “frequency illusion” and its original linguistic examples.
  2. Nickerson, R. S. (1998). Confirmation bias: A ubiquitous phenomenon in many guises. Review of General Psychology, 2(2), 175-220 · link
    The confirmation-bias component: counting hits and ignoring absences.
  3. Simons, D. J., & Chabris, C. F. (1999). Gorillas in our midst: Sustained inattentional blindness for dynamic events. Perception, 28(9), 1059-1074
    The selective-attention component: unattended items are not registered at all.
  4. Tversky, A., & Kahneman, D. (1973). Availability: A heuristic for judging frequency and probability. Cognitive Psychology, 5(2), 207-232 · link
    Why increased salience is read as increased frequency and importance.
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